Malicious PDF — malware analysis report

Static analysis result for SHA-256 843802a94f1ed259…

MALICIOUS

PDF

82.9 KB Created: 2021-09-01 17:53:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ecb46bbfc17928ae85666c966206016d SHA-1: 2fabd989946d3356ba112f5245263c7f1bfaf7c7 SHA-256: 843802a94f1ed259e4179effa14c6dc5d4741831642e9e22583dadb4d626dfb8
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to websites hosted on compromised CMS platforms, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is unreadable, but the heuristics and URL analysis confirm a link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 6

  • 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.
  • 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://leavereview.com/customerinterview/ckfinder/userfiles/files/munujixewejuzama.pdf In PDF document text
    • https://colakcivi.com/userfiles/file/32057685862.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1612f563af3fd7---66061321626.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f09c40b00cf---23460361770.pdfIn PDF document text
    • http://dralituncer.com/userfiles/file/rabixirozafaxewuredema.pdfIn PDF document text
    • http://wanyuantemple.tw/userfiles/file/xikowekijuguniwato.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af89dcb1936---75038887225.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/433137e5bb85789c8e6aa40aa18b6259/89705548724.pdfIn PDF document text
    • http://sumosushingrill.com/uploads/files/9075284979.pdfIn PDF document text
    • http://beijingbeat.com/contents//files/jobokitejupajurowovij.pdfIn PDF document text
    • https://atl-50.com/files/file/bezatusodupabejebupovaxad.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160be23f7ac44d---85033597819.pdfIn PDF document text
    • https://marbeyoyun.com/calisma2/files/uploads/zomuzova.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/gs20uraejua8pq0lhran3ngb7c/41906141475.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/b4fcee515d0b8826fe55749827158f22/visunulofalug.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/f612cd31350f6d5e34545f46409a77e6/13209853525.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/59930726938.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/23f0278c9689ea0366765cc23de0fe75/noragatu.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f69e1d951be---64309655976.pdfIn PDF document text
    • https://echipamente-scule.ro/userfiles/file/68442933118.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160ab1533a2a40---judokozuxodisixin.pdfIn PDF document text
    • https://saint-florentin.charcutier-traiteur.fr/ckfinder/userfiles/files/21095861966.pdfIn PDF document text
    • https://tpk-m.ru/files/file/75885593180.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/nuruxunefaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=positivism+in+research+philosophyPDF 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_off0000e001.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE001 10820 bytes
SHA-256: d1cebfe02f3445eee53b72f890d7901092bac37b32670ff2e48e81990e992df0
font_01_sfnt_off0000f8d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D3 17360 bytes
SHA-256: 0fca8d5a69528bc8e249fb9cc6b73b19caacf7623f1f8d9f70f58de131ee4e08
font_02_sfnt_off0001253e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1253E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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