Malicious PDF — malware analysis report

Static analysis result for SHA-256 66c73250fc6a6604…

MALICIOUS

PDF

82.1 KB Created: 2021-09-11 12:21:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: bb855c6518a9328d4957c474f623ac36 SHA-1: 14da5e2cd0ecee0fc710b654135545092c5ce92a SHA-256: 66c73250fc6a6604b42ea6958060f7fb71d9e697cda597c8e82e7d39254328b6
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to multiple compromised websites, suggesting an attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of numerous links on potentially compromised or disposable hosting reinforces the phishing and malicious download lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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 http://squash-fitness.cz/userfiles/file/27413246293.pdf In PDF document text
    • http://sandsflooring.co.uk/ckfinder/userfiles/files/vimagoxojurumetabixu.pdfIn PDF document text
    • http://galaxyjewel.cn/uploadfile/files/norosoneluteronidopigot.pdfIn PDF document text
    • http://m-camper.ru/ckfinder/userfiles/files/55923064038.pdfIn PDF document text
    • https://drhuanghair.com/uploads/files/202109030701373798.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/161374e84c1a8b---72221893524.pdfIn PDF document text
    • https://basisnomor.com/contents/files/6268630714.pdfIn PDF document text
    • http://abbeytraining.net/userfiles/file/geledox.pdfIn PDF document text
    • http://wakesup.org/userfiles/file/94658694109.pdfIn PDF document text
    • http://ministerium.pt/files/96769714911.pdfIn PDF document text
    • http://nutrizionisti.eu/public/thread/risorse/file/fuxuwimoxesubefimuzepos.pdfIn PDF document text
    • http://yuanjiangchem.com/upload/files/xokixixafiwaw.pdfIn PDF document text
    • http://indianmailbox.com/assets/images/userfiles/files/79441299359.pdfIn PDF document text
    • http://bassonconsulting.mc/userfiles/file/womumizejopuridi.pdfIn PDF document text
    • http://bbfrontedelmare.com/userfiles/files/xunoleganu.pdfIn PDF document text
    • http://spiregene.com/image/files/20210904_223706.pdfIn PDF document text
    • https://www.institutvzdelavani.cz/files/53532689055.pdfIn PDF document text
    • http://himalayakebab.com/shipinc/userfiles/files/85146502947.pdfIn PDF document text
    • http://full814.com/upload/files/tewosenifinoxisonigen.pdfIn PDF document text
    • http://gagutp.com/sa_upload/userfiles/file/20210911061219.pdfIn PDF document text
    • http://www.elstar.ru/uploads/files/zupigipesoxuluzenuteguwu.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/wibotusilaviwimaxikivuw.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16130e66720932---dariri.pdfIn PDF document text
    • http://totoquynhhuong.com/upload/files/62541161954.pdfIn PDF document text
    • http://phaptangpgvn.net/app/webroot/upload/files/28876887257.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132bdc987a18---7443981835.pdfIn PDF document text
    • https://szamitogep-szerviz-javitas.hu/ckfinder/userfiles/files/44646761519.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=pc+games+download+for+windows+7+32+bitPDF 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_off0000dac9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC9 11388 bytes
SHA-256: 5524a6f799edfe286a381a96965ef567a89e5b3fca529f555b8fd32bc16f9a87
font_01_sfnt_off0000f59b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF59B 17528 bytes
SHA-256: 70d772dfdfc0fb84a1a67497f22723db77b1e413a7dc3dc6679877766ffec8ee
font_02_sfnt_off00012286.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12286 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1