Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3146822de0c2b5f…

MALICIOUS

PDF

88.8 KB Created: 2021-08-11 20:34:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3391f7c84fa53c35a724471500462ea4 SHA-1: 1d7bbdf822440e0233bff642d2399feaeca549b4 SHA-256: c3146822de0c2b5faf99a0b106c22928bb521d6b332269b1b1f5f9685d4fc20b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to manipulate search engine results or distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9765

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://reutlinger.pl/userfiles/file/tidedaz.pdf In PDF document text
    • https://0900107678.com/upload/file/marudixizipusopikoxoj.pdfIn PDF document text
    • http://artospace.com/pics/file/45519631904.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210614002441_1489697986.pdfIn PDF document text
    • http://podolsk-kondicionery.ru/upload_picture/file/kolefagogasimetuse.pdfIn PDF document text
    • http://millecolori.it/images/file/jagilufonodox.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/9vn8raq5eh7vmmofahl2plsvb7/44546892904.pdfIn PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/folepumix.pdfIn PDF document text
    • https://classicandcamper.co.uk/wp-content/plugins/super-forms/uploads/php/files/53juvtbbpi8q2mrod9no91lp7t/wojimubekexalukiwelo.pdfIn PDF document text
    • http://ideatity.com/ckfinder/userfiles/files/pidebuvewik.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/belip.pdfIn PDF document text
    • http://sanmorales.es/userfiles/files/jobawipisogalixujuvod.pdfIn PDF document text
    • http://cwesp.biz/upload/file/wojuko.pdfIn PDF document text
    • http://xn--80aafkatcapceshpicpg3h.xn--p1ai/pict/file/24967131588.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a40ebc4b6ac---libibusalovewusu.pdfIn PDF document text
    • https://flyfinz.com/userfiles/files/35851639161.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160900f2b93a75---muruzibekogurav.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160758937200c3---tobiju.pdfIn PDF document text
    • http://sumnerclassof1976.com/clients/4/49/49b54eafcc86ae0c30eb104ab8b91c7c/File/xawupovedoviges.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/62f0dc3863146ed7bd3a04c28070ae6f/megotowevefin.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/77867b9f9d653fc86e2e5ca16cbae848/pufumepexa.pdfIn PDF document text
    • http://gwardiajuvenia.pl/zdjecia/fck/file/46740378727.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1610dbdcf00079---zubikosajo.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/vipera.pdfIn PDF document text
    • http://toptoptraining.ru/img/upload/file/vatazemaz.pdfIn PDF document text
    • https://sportnazona.bg/f/uploads/files/faludojikipixe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=comment+t%C3%A9l%C3%A9charger+gratuitement+une+musique+sur+youtubePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e14a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE14A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f95c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF95C 16940 bytes
SHA-256: 914bb7b1636fd4c6f9db6d539804f70b2aeb66756bb29a7e0d8921aab9c943e7
font_02_sfnt_off00012335.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12335 11360 bytes
SHA-256: df5d0afb98e980a264e26d6ef8a892e3de0009b7ec3d42664958e0ecaf4c4227
font_03_sfnt_off00013d2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D2C 16084 bytes
SHA-256: 325c5f5cda05429ae92d15c23118ca1b8712e485108c584e1e30b0ff615913b7