Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb73877640803a10…

MALICIOUS

PDF

84.4 KB Created: 2021-10-06 00:48:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1a1a4e21ec5376c3cdf5bffd00ec678b SHA-1: f47db4deeacc21e60bcaa69b7aed0e7cfff933c1 SHA-256: fb73877640803a1075460c5c0c455be81c27371ab7511e06518d6856c530be98
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. It contains a link farm pointing to various domains, some of which are hosted on compromised CMS uploads, suggesting an attempt to distribute malicious content or phish users. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicate a deliberate effort to create a network of links for potentially malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.
  • 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 http://officegate.biz/admin/fck_upload/file/41688337204.pdf In PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16155f96743916---1937730749.pdfIn PDF document text
    • https://pasarant0g3l-turbo-h1t.com/contents/files/15493648354.pdfIn PDF document text
    • https://j26clean.com/upload/files/xitazi.pdfIn PDF document text
    • http://ilyxrace.com/userfiles/files/68733984073.pdfIn PDF document text
    • http://www.iciparis.ru/ckfinder/userfiles/files/84166659941.pdfIn PDF document text
    • http://scherzerpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/davag.pdfIn PDF document text
    • http://phongthuyphatloc.com/luutru/files/16093951349.pdfIn PDF document text
    • http://www.pibmg.com.br/ckfinder/userfiles/files/files/10067589388.pdfIn PDF document text
    • http://zamel2.pl/userfiles/file/febade.pdfIn PDF document text
    • http://srmtteaparty.com/uploads/files/202109250816494002.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/e827db179cfdee4dbc34d21a28277f01/livatemuxuw.pdfIn PDF document text
    • http://etabetasurvey.com/userfiles/files/dewobazeridoginirugo.pdfIn PDF document text
    • http://aroma-es.red/yamituki-n/uploads/files/16691611353.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16137b63e68c63---bulozipupanupunomugadez.pdfIn PDF document text
    • https://harmony.im/userfiles/file/bedogatu.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1615c1fdbd0768---lixurisokajoxomene.pdfIn PDF document text
    • https://lacaune.hu/userfiles/file/20686082697.pdfIn PDF document text
    • http://naturalwonders.com/uploads/files/kujerafowisijogujojowef.pdfIn PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/59501046747.pdfIn PDF document text
    • http://hillsclinic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/tafudixofi.pdfIn PDF document text
    • http://fcraregistration.com/UploadedData/file/3852005389.pdfIn PDF document text
    • https://kovrdom.ru/sites/all/sites/default/files/file/98164494082.pdfIn PDF document text
    • http://artpolinakuzina.ru/pict/file/3540982927.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=grade+6+eqao+math+questions+and+answersPDF link annotation
    • 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_off0000e377.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE377 18152 bytes
SHA-256: e1676439adfb91b971ae328413944abc9a1e343e2d8a92f86b344e3f2cdbd4fb
font_01_sfnt_off000112b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112B3 11008 bytes
SHA-256: e7f331c7288e437164a9e90e2a90c591e668aa817a1a250f2fed47cf9a746b9f
font_02_sfnt_off00012c06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C06 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1