Malicious PDF — malware analysis report

Static analysis result for SHA-256 870fc10450578ea5…

MALICIOUS

PDF

70.0 KB Created: 2021-09-30 11:56:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b001a10f0b9405ffba3ef026d4113f76 SHA-1: 28cf2d248a9cbdc0fee09e701dd3c1693b0bbc89 SHA-256: 870fc10450578ea5c2ea2b511aa5dba9c65b74a91298a6e88dc9b847f83abcd7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and embedded URLs are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://allytemp.ru/uplcv?utm_term=how+to+use+mobile+as+webcam
    • https://xn--atpta-nfb.lv/images/userfiles/files/gugudivaragikulo.pdf
    • http://byty-pardubice.eu/UserFiles/File/zezudatopatusibaridol.pdf
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a48eb4fa42---legemix.pdf
    • http://gruaszarate.com/ckfinder/userfiles/files/40295246064.pdf
    • https://officialbacknumber.org/editor_up/nuburow.pdf
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614b7b2fbb0f4---teviderokosaxapovujase.pdf
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/95bdf039cc39bd72e958f652195a3857/78265313946.pdf
    • https://nsaimmigration.com/userfiles/file/bavazun.pdf
    • http://descanso.verareyes.com/ckfinder/userfiles/files/guminakefaduzubefure.pdf
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/lpd0op435ctv6g17f9u0q7b83n/rulowibisidilevi.pdf
    • https://casalindasbakery.com/ckfinder/userfiles/files/japigosixibiwirililo.pdf
    • http://christopherdallo.com/file/87385673328.pdf
    • http://mecaniquekd.ca/upload/file/50268415171.pdf
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/282b8308fc5e71681cae1d6a8af44348/dobaxonatepa.pdf
    • http://hoilhpnqbthanh.com/upload/file/83585440993.pdf
    • https://www.alugutader.fr/ckfinder/userfiles/files/93873743359.pdf
    • http://cansuyu.org/resimler/files/63445991794.pdf
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/q1bo5btccaplo33boomm68r211/puguj.pdf
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/502cb7902b1da5a4cb48e1cd7cc4811a/30510874502.pdf
    • http://www.la-rocca.pl/app/webroot/files/files/41934384897.pdf
    • http://bociany.sk/media/file/59651076001.pdf
    • http://jpind.pl/userfiles/file/wokexetof.pdf
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/si699mra626i6a258dc5fsflku/45338653524.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_off0000b0fb.bin
6fd8e45fe41be43d4366b6499f2906b24b8fd8e4505c98e0b2524c8c077b46d8
pdf-font-stream PDF embedded font (sfnt) at offset 0xB0FB 10504 bytes
font_01_sfnt_off0000c8fc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC8FC 16792 bytes
font_02_sfnt_off0000e10e.bin
2b90907a7636ee374a7e07d83cb71ef34d4e95af5e402b377f1b58660d7d8294
pdf-font-stream PDF embedded font (sfnt) at offset 0xE10E 16396 bytes