Malicious PDF — malware analysis report

Static analysis result for SHA-256 3322f24e7b9bb660…

MALICIOUS

PDF

85.3 KB Created: 2021-06-26 05:12:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4157f855c395041be4dfa0b3cc051661 SHA-1: a3451f160b2d1185d03667ac9c3b613ee61e55bc SHA-256: 3322f24e7b9bb66050d3031fff67b6605404285c0e8d22d593dd3e82a175a0c4
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple domains, with several pointing to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic findings clearly point to a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://alimentosldm.com/userfiles/file/99246191033.pdf
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/409c0c2fc6de32fbb1ad0fff0d0d11a7/poriponoxatedide.pdf
    • http://stylekd.ru/files/sagewusosox.pdf
    • http://valeneighbors.com/userimages/galaneberozali.pdf
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/j2ftnaetkks5608ocmgkvs3f12/bivawapamenesafig.pdf
    • http://agcslohian.com/userfiles/file/70500290978.pdf
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b00cbc863a---fugejesagolefopas.pdf
    • http://automsystem.com/UploadFile/file/20210622200633134.pdf
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/544cd34955d2c7a4dc494f5db23e3674/387045684.pdf
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/9581f774806343e9e4a405dfed414997/merizadugiwopupef.pdf
    • http://aqbnb.com/uploadfile/file/78090698890.pdf
    • http://ehsclassof64.com/clients/b/bf/bfa5c4411462ceee4a19e543862d902c/File/34084780994.pdf
    • http://bindashnews.com/userfiles/file/46182008027.pdf
    • http://sushinamu.com/uploads/files/puxinasibag.pdf
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/e1e1bde5b30d372ba238cdb10e2b9b77/pulimer.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/f4q0o3gg1h3kbtnfqm01vru8j1/31357022073.pdf
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/60bc886496bc325d0f16a10b1123e16a/wafisugisasawisiregovajez.pdf
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3dfec967b---83504631513.pdf
    • http://aimic.com/userfiles/file/fagilapavutifixavo.pdf
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/c05d428af55494652df937b08a3170cc/verukapupafuku.pdf
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072ce273d8bd---95360590159.pdf
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609c6035c6481---xijefofoterotufiliruze.pdf
    • http://businessdevelopmentcenter.pl/uploads/userfiles/files/10510898786.pdf
    • http://sneedfamilyct.com/clients/44919/File/43055960972.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16097312b39c58---4514904182.pdf
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5612bd04fd---walawolifimevuwukejuv.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=warm+up+before+core+workout
    • 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_off0000eab0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB0 16792 bytes
font_01_sfnt_off000102c2.bin
9c20b8fa7d86274efd5f4feed8a1f1ba0d2abf4fdd117ecfe892d81aed9757a8
pdf-font-stream PDF embedded font (sfnt) at offset 0x102C2 17144 bytes
font_02_sfnt_off00012f8b.bin
d6edf7bf02473c88caa4322506946508204009367ca8603eeb09cc740dbfa2cc
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F8B 10644 bytes