Malicious PDF — malware analysis report

Static analysis result for SHA-256 c55f8f82177cb9a2…

MALICIOUS

PDF

71.2 KB Created: 2021-09-29 03:06:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 07fc4ef1b7a2c89624cd2a6566961d67 SHA-1: 94b345b18336eb6fa1fc71a764c9f852f35439aa SHA-256: c55f8f82177cb9a2635f8d11c2880b2b06b9545c54c4009c8fea4654706be588
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS upload storage. The presence of numerous URLs, many pointing to disposable or potentially compromised hosting, strongly suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://drinkpoint.com/uploads/files/zesufinowomotasowefuf.pdf In PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16136a0e2664c7---bekelulemekutubenolagupo.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614042bab02c1---samulalezubitaxumo.pdfIn PDF document text
    • http://terfigyelokamera.info/files/file/nasikenidudewulagu.pdfIn PDF document text
    • http://autowassenindex.nl/images/uploads/9387660417.pdfIn PDF document text
    • https://vibangthuaphatlai.net/uploads/files/rapiwosanakavevakoxakof.pdfIn PDF document text
    • http://rootbeadmill.com/upload_fck/file/2021-9-20/20210920124521969286.pdfIn PDF document text
    • http://crystaltrade.hu/data/file/vowoxowigod.pdfIn PDF document text
    • http://hnfhdc.com/UpLoadFile/2021091713162824283.pdfIn PDF document text
    • http://cargologicru.com/sadm_files/sudikefiza.pdfIn PDF document text
    • https://ikansambel.com/contents/files/dalirigusepokazofosos.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16140e5527bf0c---zisexoburerotowuxulila.pdfIn PDF document text
    • http://bio86.fr/userfiles/fichiers/28365056775.pdfIn PDF document text
    • https://xehowo24h.com/images/ckeditor/files/veniw.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/ps86vf7jidvnhn68hjd6vb6tok/botow.pdfIn PDF document text
    • https://sainaudit.mn/File/79267789781.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021090321264273499.pdfIn PDF document text
    • https://partroyfuneralhome.com/partroy/assets/file/58666711482.pdfIn PDF document text
    • https://pui-vital.ro/msg_media/file/74205675737.pdfIn PDF document text
    • http://alfatreyd-mebel.ru/archive/images/file/buxajukales.pdfIn PDF document text
    • http://sh-songshi.com/admin/upimg/file///48455126209.pdfIn PDF document text
    • https://0900107678.com/upload/file/35324691246.pdfIn PDF document text
    • http://kbchina.de/upload/82253106303.pdfIn PDF document text
    • https://oriontradecom.com/ckfinder/userfiles/files/vewetamenizixuzo.pdfIn PDF document text
    • http://dochoiotovn.com/uploads/userfiles/file/64536891888.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=the+hate+u+give+123moviesPDF 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_off0000b16e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB16E 10776 bytes
SHA-256: 8d084e736ea996145feb912c11b68fd4555ab41a3d7b959c1a464ce1a34535dd
font_01_sfnt_off0000ca72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA72 16856 bytes
SHA-256: eb9855ede8be5762c9373c0f534803cc9c0fba7dab3942118fa8ac69ea942d5c
font_02_sfnt_off0000f5bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1