PDF malware analysis — malicious · 7699157e4bd574eb

MALICIOUS

PDF

82.9 KB Created: 2021-09-07 20:49:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: 47f2926c3c8e0580ad4388f2bdf95d70 SHA-1: abc88c3621f8feaf92a0c3630f1b126113627fd6 SHA-256: 7699157e4bd574eb2d95032cc3786463e4f3f95ac5ad38bd799277dd54545a3c

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as a phishing trojan. The file functions as a link farm, containing numerous embedded URLs that point to compromised CMS uploads and disposable hosting, likely intended to redirect users to malicious content or phishing sites. The use of 'utm_term' parameters in some URLs suggests an attempt at SEO manipulation to improve the visibility of these malicious links.

Machine Learning

Nyx PDF Classifier malicious score 0.9951

Heuristics 6

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

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
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 https://crewmak.ru/uplcv?utm_term=professional+embedded+arm+development+pdf PDF link annotation
- http://tv-sat.cz/userfiles/file/78451247091.pdfIn PDF document text
- https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1a1c110557---wawujidedutasadefijukobu.pdfIn PDF document text
- http://jilienjrubin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/54353871105.pdfIn PDF document text
- http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072bce30863f---rilujofes.pdfIn PDF document text
- http://lnaixi.com/userfiles/file/20210622161923_1618173278.pdfIn PDF document text
- https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/b1491531a8fbd8135047e77dff8117e7/96932228822.pdfIn PDF document text
- http://royal-pizza.eu/files/file/jawokirapozizifuku.pdfIn PDF document text
- http://megalaserasia.com/upload///55515877363.pdfIn PDF document text
- http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0920b26650d2e00e3aea2783e50aff04/48685069381.pdfIn PDF document text
- http://veivel.com/userfiles/file/pinalarobukot.pdfIn PDF document text
- https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/l8qhfa3kavf618ufv0f4097ibk/kixafemofudaboluwadasaro.pdfIn PDF document text
- https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16082578d29c44---83938407868.pdfIn PDF document text
- https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/36e4b80cc1eb3fbff4cebcd229f24c7d/movazewik.pdfIn PDF document text
- https://baohohoanglong.com/userfiles/file/558094137.pdfIn PDF document text
- https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135dae23d84f---7445877352.pdfIn PDF document text
- https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/72134514755.pdfIn PDF document text
- http://dush-kz.ru/uploads/fck/file/70832504800.pdfIn PDF document text
- https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/0af21516b373bd4651b6b4df47b1008b/57001284768.pdfIn PDF document text
- https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16109cc3910d66---12110243989.pdfIn PDF document text
- http://ordinate-ltd.com/file_media/file_image/file/5245585326.pdfIn PDF document text
- https://luathoanghuy.com/uploads/files/23323653527.pdfIn PDF document text
- https://kop-trans.pl/uploads/userfiles/files/5163727002.pdfIn PDF document text
- http://savitapiti.org/ckfinder/userfiles/files/65904654155.pdfIn PDF document text
- https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/0ecd63c808ad3de2947d9096bd8d7c2e/xolibekoka.pdfIn PDF document text
- http://yournamebadges.com/withyourdog/cms_uploads/file/48588905994.pdfIn PDF document text
- 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_off0000dd95.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDD95	10868 bytes
SHA-256: `873f26527842208ca9f1bbfc3a647e3a0abbb26eb7fd67f43ad4b7fc14ff5b44`
`font_01_sfnt_off0000f670.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF670	18084 bytes
SHA-256: `5d204c607d0c3a99fde285bf483abc8d55c8031f05a8788a20fb06e0b9616e59`
`font_02_sfnt_off00012581.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12581	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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