Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4c6eb3f15987e8d…

MALICIOUS

PDF

70.7 KB Created: 2021-10-04 03:37:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 5375804180cbb11662184a035716941f SHA-1: a1d18ae9420b9f977c1cda9b4283df8ac7de3201 SHA-256: b4c6eb3f15987e8d1fe15c22ba8b9e8a3813e770e80515c8a03bd15d84f5207a
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to distribute malicious content. The 'SE_CALLBACK_LURE' heuristic indicates the document's content is designed to trick users into calling a phone number, a common tactic in phishing and tech-support scams. While no scripts were directly extracted, the ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the distribution of further malware or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://wastran.ru/uplcv?utm_term=paracentral+disc+protrusion+icd+10 PDF link annotation
    • https://biserica-izvorul-tamaduirii.ro/files/36303438678.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/fa2b58e9425322cf661ad8c7930fcc10/govogekolomup.pdfIn PDF document text
    • http://mwbright.com/upload_fck/file/2021-9-18/20210918225054219908.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d4a0cae668---newoxumibavoxazufalunedab.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613f2f8adea5a---8183362110.pdfIn PDF document text
    • https://mosallaesf.ir/uploads/ck/files/99317099046.pdfIn PDF document text
    • http://soeurs-scjboran.fr/soeurs/upload/files/50303519924.pdfIn PDF document text
    • http://ginzaoakland.com/uploads/files/zaganetisimokubakujokop.pdfIn PDF document text
    • http://myphamhelios.vn/luutru/files/pubipikivigosuvodorejabag.pdfIn PDF document text
    • https://zooiguana.pl/app/webroot/media/files/sarosepew.pdfIn PDF document text
    • http://mingmitrcoffee.com/user_img/files/javetupigobibaburizig.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/jutepefalovezetisujo.pdfIn PDF document text
    • https://greengenome.in/admin/userfiles/file/7238338567.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/51547187144.pdfIn PDF document text
    • http://zeci.nl/im/image/tusibagubiwepelebanovafe.pdfIn PDF document text
    • https://ms02bet.com/contents/files/70502357487.pdfIn PDF document text
    • https://nonbodepsg.com/uploads/files/vulubetuwikitaseforuralu.pdfIn PDF document text
    • http://wwsm-us.com/files/file/sagebumok.pdfIn PDF document text
    • http://westernstudioservice.com/admin/userfiles/file/71955910714.pdfIn PDF document text
    • https://nakipoglugroup.com/upload/ckfinder/files/fowabodenorosinawasole.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/1df377b95508fafba2575a402ab90768/13781437354.pdfIn PDF document text
    • http://cmtsport.com/pliki/tuvupigagitug.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16158934246e23---46147458563.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/432921aa7702cbba5771cd55b1ef9594/wuzetoguzuxifefedat.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.

FilenameKindSourceSize
font_00_sfnt_off0000b3d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3D0 15800 bytes
SHA-256: e2e5d2f40dc5603d51d52a3af76058a2ea4579bef83042a569107bc1eaa3f639
font_01_sfnt_off0000dbc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f3df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3DF 10784 bytes
SHA-256: 518e63e0cd3aea33e90c1d51b3a7da6826b2a66e4a798286248f2f018ec4574f

Open this report in the interactive analyzer, or submit your own file for analysis.