Malicious PDF — malware analysis report

Static analysis result for SHA-256 f15bac20167c2972…

MALICIOUS

PDF

102.7 KB Created: 2021-06-27 09:08:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 12654156c9d69b5a4d0e67a98eb62f91 SHA-1: a4067879e61dd70e3c29d56ce482c712ea3308bc SHA-256: f15bac20167c29723dfdcb36f32ded385b637467f5ff9f94c61186b774d051a9
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised CMS uploads, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery via these external links. No scripts were extracted, and the document body was unreadable binary data, so the attack pattern is inferred from the link farm heuristic and the presence of external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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 http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd74d50e1e---geralofenazenodidobonoliv.pdf In PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c69ad00cc4200b432aa1604723c3b0e0/vidujuzosojojazuxejo.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/efdbb99eee882f881fc38ced9a711bd2/45518117924.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a704d041e83---78801866981.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be775a79b6b---rugowimo.pdfIn PDF document text
    • http://www.kymkarajok.net/tiedostot/files/pepida.pdfIn PDF document text
    • https://gencerenerji.com/resimler/files/vufuzuxusotitutupoj.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160702c5f267e8---zigowiz.pdfIn PDF document text
    • http://rafaelokazakov.com/file/13041308551.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/8a9f2f53a8501a00858b2ddf1395d0e5/38282266010.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606da720c8470---90255063002.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0709741160---90571317233.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/c8508f263a02ffe1cbbea4acbf1552a0/81284045899.pdfIn PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/63d60da9bafafcd2cea56716086471aa/27674454992.pdfIn PDF document text
    • https://liderpin.com/calisma2/files/uploads/wewutawutexolumo.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/rupod.pdfIn PDF document text
    • https://mattress-leader.com/media/99043340894.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/cd4352c5081784f7e52f7b30d81a9ab7/16608470641.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f6c809563---52864111745.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fbbe4f24c0---61317794164.pdfIn PDF document text
    • https://www.nexidia.it/wp-content/plugins/super-forms/uploads/php/files/bfae27d7ee4ddc903b3f570b7b6e776d/78208473253.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/kubujawabumujifusezavifaf.pdfIn PDF document text
    • http://auroraenergyproject.it/userfiles/files/89325550608.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=giving+dogs+raw+chickenPDF 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_off00012e8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E8C 17240 bytes
SHA-256: b11c301e36d84e75c5012707602f32494e7ce1fb061d5c7554b3dac2b0e4172b
font_01_sfnt_off00015b74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B74 10788 bytes
SHA-256: 0be275ae3c474d343aca17533b5e16612dae4ff7201a4e804dbc0ec73506eefe
font_02_sfnt_off00017422.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17422 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1