PDF malware analysis — malicious · 7a11f66ba7f6dd95

MALICIOUS

PDF

79.7 KB Created: 2021-06-28 19:48:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13

MD5: a4924671f55cdef64e9b45a9ae631ca6 SHA-1: cbf0fe68384e8cc9c2014d63be964de110ab1d65 SHA-256: 7a11f66ba7f6dd95eb852ac3dae6abf2f3c3d747b1b76bf37f51de7de1ed4d83

196 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1534 Steal or Forge Credentials

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan. Heuristics indicate it is a brand-impersonation credential phishing lure, specifically impersonating Microsoft. The embedded URLs and link farm structure suggest it is designed to redirect users to malicious sites, likely for credential harvesting. No scripts were extracted, but the PDF structure itself facilitates the phishing attack.

Machine Learning

Nyx PDF Classifier malicious score 0.9844

Heuristics 7

ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH

Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=what+is+your+windows+password.
PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM

PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM

Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
External URI info PDF_URI

PDF contains an external URL action
Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL

The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
URL http://gptools.net/userfiles/file/21923071112.pdf In PDF document text
- http://megalabsrl.it/userfiles/files/33794358188.pdfIn PDF document text
- http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac3ee70d21d---29141814870.pdfIn PDF document text
- http://www.irrv.org/uploads/files/98951551414.pdfIn PDF document text
- https://dvg.asia/ckfinder/uploadfiles/files/sowaruputupolotox.pdfIn PDF document text
- http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca220530fe---97560374068.pdfIn PDF document text
- http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/621491dd21c29d6ee2717570a02ac550/24943418581.pdfIn PDF document text
- https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c036c2ddc6d---pogotobe.pdfIn PDF document text
- https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/80d0ee0317d939264cb438282c0fb4c6/91689004848.pdfIn PDF document text
- https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/19e6c45de01da56a68e49f820d2da27e/tomaxobiw.pdfIn PDF document text
- http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/5k7mtljc1ls0ofek55vkd94sb7/silekokisoxilamupe.pdfIn PDF document text
- http://ahlhy.com/uploads/file/030837171693.pdfIn PDF document text
- https://p99.tw/pro_pic/files/bozezoluvizedujatebujox.pdfIn PDF document text
- http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/894a419ea33b5ad362c1188c4086518e/taloxaku.pdfIn PDF document text
- https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a96dff3a68---23283219156.pdfIn PDF document text
- http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/391da4942c363e3ce88e2ea20279d071/49803170867.pdfIn PDF document text
- https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/786db58c77431c7e98cd6a0170f96e45/xekikarez.pdfIn PDF document text
- http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a42e50a4f05---853396046.pdfIn PDF document text
- https://biocoils.com/img/file/wuvasedodowiseronuba.pdfIn PDF document text
- http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/1b1660f7b8d50a30bb8c50261ee6c0ef/52822424049.pdfIn PDF document text
- http://mdsalon.ru/img/lib/file/70592862355.pdfIn PDF document text
- http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b5da3d24795---12878472768.pdfIn PDF document text
- https://wulf-sanitaer.de/wp-content/plugins/super-forms/uploads/php/files/8nmrdc0c5jh5elulaa8ajvg10m/52058782518.pdfIn PDF document text
- http://anthonyvienna.com/sites/default/files/file/xebodifoto.pdfIn PDF document text
- https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/oe6cjpqvjlvujp6e2t8sc0a0m6/ridowizuwilopujudari.pdfIn PDF document text
- https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/o0761l9inql9q5u4mbdm8dr7a0/jemiwusaridikozuka.pdfIn PDF document text
- http://lycee-elm.org/userfiles/file/kusan.pdfIn PDF document text
- http://sity-luxe.ru/userfiles/file/95382463862.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=what+is+your+windows+passwordPDF link annotation
- http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
- http://purl.org/dc/elements/1.1/In PDF document text
- http://ns.adobe.com/pdf/1.3/In PDF document text
- http://ns.adobe.com/xap/1.0/In PDF document text
- http://ns.adobe.com/xap/1.0/mm/In PDF document text
- http://ns.adobe.com/xap/1.0/rights/In PDF document text
- http://dejavu.sourceforge.netIn PDF document text
- http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000d624.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD624	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000ee36.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEE36	16452 bytes
SHA-256: `42c36a45c148b48c017a9978e8717e41b6b1e799ec6fcd20d842e48ad3a96df7`
`font_02_sfnt_off000118de.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x118DE	10604 bytes
SHA-256: `9cb711d239902cdfc14cafe8722973125c293fbb1c2496c9653b20bd8aaab014`

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