Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d9b8e1788f0020c…

MALICIOUS

PDF

97.7 KB Created: 2021-08-08 09:11:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 01b2b96082f909e0f772f61d1407a711 SHA-1: 2ea2e3969e1eeafa35236b59ddcd0bcb7984277b SHA-256: 5d9b8e1788f0020c2fd262e90b937d95973fc9a3f46e1044e15cf1ceee34791e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/cah591bofu0kdpolavcajqhgu0/72246396682.pdf
    • https://etonbio.com/newsLetters/images/file/xajusaduvibenekaxasato.pdf
    • http://polymer-optix.de/userfiles/file/6124020806.pdf
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/a86d3c85197a86c1fa067abe220bf2e2/temizajokiboduxax.pdf
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607b34c69cb3c---89196265240.pdf
    • https://rosettes.it/userfiles/file/gasebu.pdf
    • https://assignmentmart.com/ckfinder/userfiles/files/fatizilazuwulavotitu.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a15e251f7b3---84547323779.pdf
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610f3ee90a181---72442208267.pdf
    • http://smn1970.com/clients/d/d4/d44d2684521ac238e4bdef02d06179b0/File/65866081710.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160884d7b5d868---futikutodel.pdf
    • https://bamfieldrental.com/userfiles/file/95739123543.pdf
    • http://sl-light.ru/design/img/upload/file/mabirug.pdf
    • http://irths.com/upload_files/files/puradekiji.pdf
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1608199f00a9b7---zafakuxofifaxal.pdf
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/q8trup89n2chathu8ovsqsn1k3/xetekuvifagevusoxoluni.pdf
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097b23f98037---63030895642.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608c008fb886d---kumiga.pdf
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/f1f9fa35c16cc7e03e0d5ae42fc8da73/14897074210.pdf
    • http://nakakinpump.kr/fckeditor/upload/file/33692294191.pdf
    • http://www.majbrno.cz/uploads/files/saraxutapuxevulimox.pdf
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160871d47c200a---gojupusawiturekeduraxo.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=badland+winch+12000+warranty
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000118be.bin
b8db8ba3e14a12775a2223712275785cdecc5302be3ef4a76bc76043e9b74025
pdf-font-stream PDF embedded font (sfnt) at offset 0x118BE 18072 bytes
font_01_sfnt_off000148b0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x148B0 16792 bytes
font_02_sfnt_off000160c7.bin
a4cb15e77a7df843cab033e004a51c4cc0f753dbd0a2c0bc6043bbc6dd76f1a9
pdf-font-stream PDF embedded font (sfnt) at offset 0x160C7 10592 bytes