Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bf2bc61d3144ca1…

MALICIOUS

PDF

80.5 KB Created: 2021-08-28 02:19:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1785e2b58c785f5aa7ce7e626724c85c SHA-1: dc5e802936d6526907118a18f2e3ece303040124 SHA-256: 8bf2bc61d3144ca181b48abf534a27250047613c2f1e3c348f01e7d0de972fb7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple potentially compromised WordPress sites, suggesting an attempt to distribute phishing content or further malware. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/ou9uul5spdo9v4scso6d55rfvk/78647126471.pdf
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/9680365a0ebc6a8dcb126e269bbbe1dc/gagalodufajoxofi.pdf
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/a75990965f1f385c103922a312f6fd9d/94912853497.pdf
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160cb2d9a251c9---bapukidewi.pdf
    • http://aimic.com/userfiles/file/16310698487.pdf
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c32b066f88a---55012160614.pdf
    • https://alnahamgroup.com/userfiles/file/jazuveriditefozos.pdf
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c002e854417---87561781807.pdf
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/bi4fbsnacfctik5rp12u1bpbkl/pojurimulurumifukovinik.pdf
    • http://otczenacts.com/media/files/31663522823.pdf
    • http://kaizousha.com/js/upload/files/37594538359.pdf
    • https://anne-berger.de/sites/anne-berger.de/files/fkcfile/bososilugewelawe.pdf
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e66ea77f40---29925107040.pdf
    • https://martabaktelor.com/contents//files/lilixiwipewal.pdf
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/ev55oku77v0ltbfb84k5abj94m/42914216791.pdf
    • https://officialbacknumber.com/editor_up/jajipinoga.pdf
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/ts9ucm80sra9df1usk8mnl4od0/xekusekak.pdf
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076cf0932687---66104423924.pdf
    • http://laureysnv.be/uploads/files/21674931068.pdf
    • https://10glazsikeyrosa.ru/file/22221546528.pdf
    • https://ksa-machinery.com/images/file/93693453838.pdf
    • https://regiefranchet.fr/userfiles/files/25891944478.pdf
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/767e012f8503dc7cd95faafaf7566b48/93056043124.pdf
    • http://retroldn.com/userfiles/file/werotixek.pdf
    • http://sushi-belovo.ru/files/detanunukidi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=noun+exercise+for+class+7+with+answers
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d1d9.bin
80562180bf73976bc89bda0ab86550e3bab6a6adebfda0bcea1b9e3951346a30
pdf-font-stream PDF embedded font (sfnt) at offset 0xD1D9 10748 bytes
font_01_sfnt_off0000eaa7.bin
9852c9ba85afec4a0b9656fbb6061b21d7630ade08da671b12700547f0eb6a57
pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA7 18676 bytes
font_02_sfnt_off00011b21.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B21 16792 bytes