Malicious PDF — malware analysis report

Static analysis result for SHA-256 33bdff47dc199af8…

MALICIOUS

PDF

86.3 KB Created: 2021-07-29 22:29:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fc04ff23f031f062f8ed05d524ccc573 SHA-1: 14d8064aefbf943f9b41cd57f6e230cd559c7d3c SHA-256: 33bdff47dc199af88bd13ec351e27dbdf8e068f718f4954071881260947e5c4c
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's purpose is to lure users into clicking these links, potentially leading to credential theft or infection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://archism.ru/uplcv?utm_term=template+powerpoint+tentang+sejarah
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/0c61d85dfcceec3782c78acb6696c62f/43827726951.pdf
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608468316e676---vumabilovivalazetel.pdf
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5882e8515---78114889825.pdf
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a6789d041c8---32699719879.pdf
    • http://playbabydoll.com/userfiles/file/ligunasafowanutifijosa.pdf
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/2nei2ec7irdv6stle64f6enner/10628435004.pdf
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/1i38uqtvt3f05s5ndfrhbljbcp/sodulitamolom.pdf
    • https://rotherelectric.com/files/wejebotasilino.pdf
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/ob4q83tr0ikqoubcks2fa1den9/92475112284.pdf
    • http://greenberetrotcmedals.org/clients/e/ee/eef2f5edcbf7b69ea683240098563b39/File/wafina.pdf
    • http://jerilyndavisrobison.com/clients/870655/File/95829042012.pdf
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/967d393878b7a3b12937e984fd4f572d/kulufirabobid.pdf
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/tfut2fj7t4oda0mga6n6evo4bg/64456622649.pdf
    • https://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/42856802565.pdf
    • http://cdseoulps.com/uploadfile/fckeditor/file/38921122247.pdf
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/35a9cae1d8b6e76a203ef2d83048cf6c/34116415938.pdf
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607950afe22f8---63400069782.pdf
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/8ugevgquv08m54ukacq6cnectv/gudidemikujuja.pdf
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/iro033mvhpli74o4vbm7ofrf60/sowugiviralajogaxa.pdf
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084b088caf15---pomexomufixawafijumenad.pdf
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/28ae61d371fa01a4ae9ef1b02abe9b58/murukudejamipog.pdf
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/hatqgp2cpaklgb3imgjikjtrl0/rekerafokidasax.pdf
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16087938388655---sunuwinimaluxatiwupujuko.pdf
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa1a169e7e6---96373827035.pdf
    • 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_off0000ef5c.bin
e68985c6336f047108aeaa1492313ee02da2d1425a4f3476cad56fab83686326		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5C 10880 bytes
font_01_sfnt_off0001084c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1084C 16792 bytes
font_02_sfnt_off0001205e.bin
c51ac182069b45d48aeb508478bdc5775d6b3910a15d41062fdb8df01e0a7525		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1205E 16496 bytes

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