Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b1ac670b43cbec9…

MALICIOUS

PDF

87.2 KB Created: 2021-07-03 16:56:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 8883b930a280b93e032660c591e03ef4 SHA-1: abdd3ded7da144f70a99ecfd10874b65ff6115aa SHA-256: 0b1ac670b43cbec91cf2b7928a8db85e8774d38e08b36b8ea3dd915bd79dee38
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm designed to redirect users to malicious content. The presence of 'utm_term' parameters in some URLs indicates a potential phishing or SEO manipulation tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://infrive.ru/uplcv?utm_term=treatment+of+colic+pain+in+newborn PDF link annotation
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/vv67s6no4gc4e0euh0u073esv5/vixutapowelizorupovul.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c55eda33f44---xigizejepilatitoxe.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c697bc0efb---namaloduwolanukizepozuxif.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16092e9e5ef054---34661045792.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a1b4dc6ad8f---16418416341.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/532627b424383192c2457ea9b57d6692/nupozonodobawanifigabixig.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160892ab85d4b4---xuxamedu.pdfIn PDF document text
    • http://xn--80aamdqpfpr.xn--p1ai/upload_picture/zovebemi.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/f86bfd56e794cf287a6818634f28c9ea/62521877877.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/5608144618.pdfIn PDF document text
    • https://ahha.az/userfiles/file/17870906226.pdfIn PDF document text
    • http://zonweringbelgie.nl/ckfinder/userfiles/files/80067354526.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086460108f89---58189825515.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16092389e0b2d8---66595559117.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16073214a88ac0---64225256351.pdfIn PDF document text
    • http://heyumpnd.com/userfiles/file///108880889.pdfIn PDF document text
    • https://menu2uplus.com/images/file/51185659504.pdfIn PDF document text
    • http://caryhigh1987.com/clients/41333/File/21931090097.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/17220329430.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/vuzanipu.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/f14a93b347ad13562904e414fa0ee210/zugidasegebobofatopifar.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/ade3e21dd7f894f42605eea866f43f15/74432180947.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/2123776274.pdfIn PDF document text
    • https://ivanamihic.com//files/34267936189.pdfIn PDF document text
    • 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_off0000f4aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010cbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CBC 16460 bytes
SHA-256: 9c98ce10e49b308f138369d644a94b49535384f9ba8d68c7fe2a31bf74cae193
font_02_sfnt_off0001375d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1375D 10660 bytes
SHA-256: 31a664d2a866a889981e65867bb2d3585520d87adadd73633957822886c17cf3

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