Malicious PDF — malware analysis report

Static analysis result for SHA-256 beb56571f35434b3…

MALICIOUS

PDF

79.7 KB Created: 2021-09-23 17:25:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 36d53fdbd14c58ff0dd2add858837b5b SHA-1: f517105bd54344773448d60c9a5eb1b23fc0eb61 SHA-256: beb56571f35434b322a7c1fa217e7bd8651df0b7407d697482377a01723d5ec4
156 Risk Score

Malware Insights

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

The file is a PDF containing numerous embedded URLs, many of which point to compromised websites or link farms. Heuristics indicate it's a link farm on disposable hosting and potentially a phishing lure. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. The primary attack pattern involves tricking users into clicking malicious links within the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5916

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://crewmak.ru/uplcv?utm_term=wifi+brute+force+attack+apk PDF link annotation
    • https://rjpexport.com/files/91953908063.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16134addf37613---60364192571.pdfIn PDF document text
    • http://taxilitomerice.cz/ckfinder/userfiles/files/78173965297.pdfIn PDF document text
    • http://karpatskiles.ru/store/files/91339986076.pdfIn PDF document text
    • http://thuannam.com/image/files/vegokada.pdfIn PDF document text
    • http://indianspringhomes.net/userfiles/files/jasafaburobuzezuvaz.pdfIn PDF document text
    • https://mraos.com/web/userfiles/file/sapejov.pdfIn PDF document text
    • https://kuepancong.com/contents/files/25973794831.pdfIn PDF document text
    • http://arsvet.ru/img/upload/tipopotusom.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/98474631071.pdfIn PDF document text
    • https://hotlinepro.in/admin/userfiles/file/pedirimeneriwulefunagabox.pdfIn PDF document text
    • https://jackinthegym.com/uploads/files/202109020331178557.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/c75aef342862661e8fcdd0a005ada21b/23378801885.pdfIn PDF document text
    • http://aranykoronakft.hu/userfiles/file/gevelenejusaga.pdfIn PDF document text
    • https://sharedsynergy.com/userfiles/file/rolewepavadepapife.pdfIn PDF document text
    • http://khonggianxua.samdigroup.vn/app/webroot/upload/files/bapezesobasaki.pdfIn PDF document text
    • https://fuoriscena.eu/file/9514023409.pdfIn PDF document text
    • http://cjmfgx.morefriendship.com/upload/files/1418114193.pdfIn PDF document text
    • http://lachambredechos.com/userfiles/file/mamugiwamotemug.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149778927d94---zogebixuwale.pdfIn PDF document text
    • https://matrainagycsalados.hu/userfiles/file/vovanakisumo.pdfIn PDF document text
    • https://kimcert.net/E/file/43500817232.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/db72f91761b13334ab1bfc3de07dbbf4/42261552926.pdfIn PDF document text
    • http://grubstreet.ca/ckfinder/userfiles/files/xomuvurijaborajuxunudole.pdfIn 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_off0000dd55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD55 10480 bytes
SHA-256: 3f231125b7bbf5e69ef99b7efeac16ed395edb551f829382f5e9891f233153d7
font_01_sfnt_off0000f51c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF51C 17824 bytes
SHA-256: 61ae4c979202ca650d1eb040d11ad57be07d62b5e734513bd5f108a9bd1eaf12
font_02_sfnt_off00012320.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12320 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1