PDF malware analysis — malicious · e63f009f5df7d7ca

MALICIOUS

PDF

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

MD5: 0b38bf7b947eb878103a8fe98bd08dd5 SHA-1: 979f14e1c5155df18fc79b3f00870dec9454bf09 SHA-256: e63f009f5df7d7ca3c820a4373da6300f9ece071cf3bc74a6f7d3c18c43d37d6

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic further support this, indicating the PDF's primary function is to redirect users to potentially harmful external sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9955

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://philabc.ru/uplcv?utm_term=barbie+dreamhouse+adventures+apk PDF link annotation
- https://camphacement.vn/upload/files/47839907569.pdfIn PDF document text
- http://studioriboldi.eu/userfiles/files/zeluwizeped.pdfIn PDF document text
- http://bernardthevenet.fr/ckfinder/userfiles/files/48464531913.pdfIn PDF document text
- http://istanbulballoons.com/ckfinder/userfiles/files/zosum.pdfIn PDF document text
- http://scandirent-new.ru/uploads/assets/file/zomapuro.pdfIn PDF document text
- https://ms1oke.com/contents/files/vogatevupepuzuzugorolitij.pdfIn PDF document text
- http://absolutelyneon.com/userfiles/file/lutigagasutago.pdfIn PDF document text
- http://sz-nuoyi.com/Upload/file/2021090306581965049.pdfIn PDF document text
- https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f97f07bf09---93943827608.pdfIn PDF document text
- http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a8a0a932eb---14193609318.pdfIn PDF document text
- https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/161388bed64d21---tafumavewuzukenaba.pdfIn PDF document text
- http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/judadovoroga.pdfIn PDF document text
- https://nezrenpin.com/calisma2/files/uploads/52069824094.pdfIn PDF document text
- https://10glazsikeyrosa.ru/file/69282536709.pdfIn PDF document text
- https://tuoitre.bacgiang.gov.vn/lib/ckfinder/files/6922888105.pdfIn PDF document text
- https://sistemagestiondpr.com/userfiles/file/55137628987.pdfIn PDF document text
- http://bjxbw.cn/userfiles/file/31431934909.pdfIn PDF document text
- https://bednidhitraders.com/userfiles/file/xomipaxegamebeb.pdfIn PDF document text
- https://michelbarbot.com/upload/files/51925142399.pdfIn PDF document text
- https://driftwoodcc.com/userfiles/files/20639971916.pdfIn PDF document text
- http://aucoindeshalles.fr/menu/file/58841445461.pdfIn PDF document text
- http://www.electricman.in/demo/frontend/web/uploads/files/jeganepopoxevirav.pdfIn PDF document text
- http://slbreakingnews.com/ckfinder/userfiles/files/sorerewotom.pdfIn PDF document text
- http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a178d744d6---49093789096.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_off0000d800.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD800	11060 bytes
SHA-256: `9eb8e34bd7a344e2077ff25e5137780ff2f13d202218396c398a08080b6b3789`
`font_01_sfnt_off0000f171.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF171	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00010983.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10983	16860 bytes
SHA-256: `20c5d8e6e12ca48eecd6da4a3a4b319eff8ccb0c0a6660eb3de75973de56a17d`

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