Malicious PDF — malware analysis report

Static analysis result for SHA-256 82bf65434504a4dc…

MALICIOUS

PDF

85.9 KB Created: 2021-07-08 12:50:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 1a62e47cf1622176a0a83816f2db2a6b SHA-1: fdbe1f02ab8b6f5bebf8428a1cc75fe4eff9ec33 SHA-256: 82bf65434504a4dc211a74479bb82c2806c422bc687d701f421ab50539740a7f
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable domains, suggesting a phishing or redirection campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or exploit kits. No scripts were extracted, but the link farm structure is a common tactic for distributing malware or conducting phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607289b45dd3e---72977959541.pdf In PDF document text
    • http://technocom.pl/editor/file/bifeparobowerobatopa.pdfIn PDF document text
    • http://ilovegabal.net/fckeditor/_upload/file/radasavesafe.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/e2b64fb3a674c373e104d1d90e27668c/rufumazitarudelu.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/tr84bn3oq6teh3pdsuqc656t4o/vofoxuxurumovuto.pdfIn PDF document text
    • http://kapsalonvogue.nl/files/file/majobegogabobexilukebigi.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/9286dadc1573b04c52e77772e7a9e19f/78643629622.pdfIn PDF document text
    • https://vigiweb.cl/dinamicos/files/file/sexajisewekujagoxorilulo.pdfIn PDF document text
    • http://gsxr.hu/userfiles/file/befabaf.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608e586cd1469---77722439391.pdfIn PDF document text
    • https://mma-montessori.com/admin/ckfinder/userfiles/files/zemimiwor.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5c7ca9560f---89072328360.pdfIn PDF document text
    • http://aquatrustfina.com/userfiles/file/19290540399.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/448475ec3b0ee6712d6e6f36eecaf9a2/50312633383.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/cb7734a02b323f6564d391e7921b933b/69398512482.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1608fadf06edf3---jesasapabobuma.pdfIn PDF document text
    • http://vervesimuhub.com/userfiles/file/84168928007.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/5281bd45bf6c85e98597e7c768cfad7c/degasub.pdfIn PDF document text
    • http://ludifrance.fr/userfiles/file/78491979675.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/5nq0ak26e7m7aq3bbnj9s5d0e7/33033809988.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210601181858_i60vof.pdfIn PDF document text
    • http://ahchala.com/img/file/8340319019.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160de10cb64dbd---20194354455.pdfIn PDF document text
    • http://srutimusic.org/userfiles/file/dijopenemimalobazotixit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=coal+comes+fromPDF 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_off0000ed4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED4C 17620 bytes
SHA-256: c11b49cf6b6506f1b51f70d73b3f139ec6375c649c8065caf94d46144808885a
font_01_sfnt_off00011b60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013377.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13377 10236 bytes
SHA-256: 93521dc4089f787534bf2e42e2bd80c5a407ac537d6e7d05eabc96510fe6ef03