Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9bb6c74b52905df…

MALICIOUS

PDF

78.0 KB Created: 2021-09-21 13:15:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: edc8a21c438ba2f6872e6aedba429bbe SHA-1: ece0fd09176beaed7a05a8caa0ba1f5a080e2511 SHA-256: d9bb6c74b52905df779080c3af9db06d65941b5b540bc6f2553cb44af0e8024e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a phishing or malware distribution campaign. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this, pointing to a tactic of using link farms for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://pistant.ru/uplcv?utm_term=face+lite+download+apk PDF link annotation
    • http://resheto.ru/users_images/fck/file/sajepuginogido.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/dc8503741c36f881a4a327036817979d/70144634911.pdfIn PDF document text
    • https://universitecentrale.net/uploads/FCK_files/file/bakitavavufipiwotad.pdfIn PDF document text
    • http://studioaba.net/userfiles/files/dalorubunebaduxufu.pdfIn PDF document text
    • http://softtox.pl/new/userfiles/file/3564962008.pdfIn PDF document text
    • http://webs123.com/userfiles/file/lebijoxowidedipeju.pdfIn PDF document text
    • http://angelofthewinds.org/ckfinder/userfiles/files/nezemojegizi.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613d120111fa1---52216843440.pdfIn PDF document text
    • https://brawlcall.com/ckfinder/userfiles/files/kotubatef.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614912209759f---20247289906.pdfIn PDF document text
    • http://kiiga.ru/userfiles/file/ravijegonuvibofi.pdfIn PDF document text
    • https://drbumbnursinghome.in/ckfinder/userfiles/files/ziveparukuselaloxureki.pdfIn PDF document text
    • http://flomojapan.com/upload/files/57527160989.pdfIn PDF document text
    • https://kede.org/userfiles/file/wekerexesalate.pdfIn PDF document text
    • https://skillmapmagazine.com/ckfinder/userfiles/files/gimudulodusu.pdfIn PDF document text
    • http://abcgsgeds.friendship-match.com/upload/files/69230264748.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613e404ab8c16---senajexegedeg.pdfIn PDF document text
    • http://tearose-kitchen.com/sites/default/files/images/imcefile/52505595738.pdfIn PDF document text
    • https://www.colline-eternelle.com/ckfinder/userfiles/files/1279455043.pdfIn PDF document text
    • http://irk-yoga.ru/upload/files/56145123259.pdfIn PDF document text
    • https://www.cifphosteleriayturismo.es/ckfinder/userfiles/files/fubiwojaga.pdfIn PDF document text
    • https://astefin.ro/ckfinder/userfiles/files/13625893854.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/94766477703.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/80521726720.pdfIn PDF document text
    • http://ecovn.vn/uploads/news_file/voxinenuj.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_off0000cda2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e5b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B9 10392 bytes
SHA-256: 7d829eed4abe35edea202683f209b74b4eb75d27600eae2f3743ee9cb15c7e46
font_02_sfnt_off0000fd62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD62 17376 bytes
SHA-256: 5d95497ac7dcd061461b367537fff415943bb2c4a62a1d877bcab4fbda070d98

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