Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea8b56205dca97d8…

MALICIOUS

PDF

91.8 KB Created: 2021-07-31 04:46:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c3a338a92c643641c89d2a287371cd4f SHA-1: 49461959bdcb27febe94fcba66086d63f75e9b7c SHA-256: ea8b56205dca97d8d379f4fe006b8e5d87e489baaa1791f67fd6690d904717aa
164 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of multiple external URIs and link farm heuristics confirms the document's primary function is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://irlanc.ru/uplcv?utm_term=how+do+you+change+the+time+on+a+talking+atomic+watch PDF link annotation
    • http://roanfamily.net/clients/0/01/01b24a6c100194bbc8678883f3cd4a53/File/lezitexufisesejusijavabo.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/deeab97a99c460967dba49e2539293f1/82380966293.pdfIn PDF document text
    • http://staples1981.com/clients/b/ba/ba027a536d51c1d997ee76cae6dc9017/File/nilerudubega.pdfIn PDF document text
    • http://momsystem.ru/public/file/jodekevasoseg.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c76d8412efb---17247175737.pdfIn PDF document text
    • http://fxmeat.com/upload/file/b7b54f883265ff562545fbeb5feb91b8.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/vazilomapopizotudad.pdfIn PDF document text
    • http://daehwa.info/uploaded/file/jikabevi.pdfIn PDF document text
    • https://fereshtegan.net/basefile/fereshtegannet/files/42234546414.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/fd57af357fe0fac4482563cfcc51aac1/zazekejurabukavosiz.pdfIn PDF document text
    • http://harasim.cz/uploaded/files/buwofavefiwotawuvurig.pdfIn PDF document text
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/c6a9548e251c0f3fff0719de68461999/60075328514.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/718e2c396498dd9ee27e4e37b5912645/47459060170.pdfIn PDF document text
    • http://shangrilatheshow.com/ckfinder/userfiles/files/74604606414.pdfIn PDF document text
    • http://diamondsnspurs.com/clients/12200/File/kopejaxubetajavosam.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/rizifet.pdfIn PDF document text
    • http://zonwering-belgie.eu/ckfinder/userfiles/files/zisorijubunukafe.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/eef10412f85b0cfcf96d46043bb96536/59620810394.pdfIn PDF document text
    • http://coffee33.ru/archive/file/zikebirumugufanamobe.pdfIn PDF document text
    • http://smartpaintingplus.com/userfiles/files/difam.pdfIn PDF document text
    • http://jhdjt.com/images/upload/File/mukatefenezifonokut.pdfIn PDF document text
    • http://rustproofingottawa.com/userfiles/file/96819907077.pdfIn PDF document text
    • https://laptoptranganh.com/data/dulieu/files/fejulosuruleluwigiwubu.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a713f6e7691---ruworinigagimidab.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c330ba9dac---11102110761.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/v2ogs0f1kkvvr5fbel7to9r0gt/samufenoxuvu.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_off000102e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E3 17196 bytes
SHA-256: 07326713d62fb059275809cb212aa0c51f55125f2311d031a78dde5853e7b67e
font_01_sfnt_off00012f97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F97 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000147ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147AE 10932 bytes
SHA-256: 230e5fec66a70a06f6ae2979b6b0f531927e9ab15e84f1955201e715aedaa78c