Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad437eeb3f34c43f…

MALICIOUS

PDF

105.0 KB Created: 2021-06-27 11:10:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a53c5094ab81c6e7e4b607646a745763 SHA-1: 34065ab7f94b1c3525d707e3c39a0a3d285be4c6 SHA-256: ad437eeb3f34c43f681ea7c030a7f2d79ee7aeeca6024e4102893b5b0ab2a39b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan distribution attempt. It functions as a link farm, with numerous embedded URLs pointing to external sites, some of which are hosted on compromised WordPress installations. The document's primary purpose appears to be redirecting users to potentially malicious content or further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://garglob.ru/uplcv?utm_term=detox+water+for+clear+skin
    • https://prosperitas.be/data/assets/file/56284545785.pdf
    • https://mangonebike.com/uploads/file/vavulozuvexoxafisosixoz.pdf
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160889f765b2e8---tepomafup.pdf
    • http://nowator-zpu.pl/userfiles/file/71778911445.pdf
    • http://muzeumostrowiec.pl/obrazy/file/98549456520.pdf
    • http://anhuifan.com/upload_fck/file/2021-5-4/20210504174708657153.pdf
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/t3ricq7hr572lc3etrmdtm75l7/75969513845.pdf
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c298425d541---40931199492.pdf
    • https://tosto.cl/ckfinder/userfiles/files/dusixiwojorovoxejuli.pdf
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d69f7d3d411---jovadinujabuvusoxivike.pdf
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac2fa66751---pemosodejofenemobegid.pdf
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/gv499ork0r6qk620crkgdcienk/vipogifiw.pdf
    • https://study4student.com/cache/fck_files/file/filonowo.pdf
    • https://planet-for-events.de/userfiles/file/jipemorojodo.pdf
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7f2941e1c---xosefaruvito.pdf
    • http://gerd-pollak.de/userfiles/file/12837856712.pdf
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/67ha9kvvi78rp99q00e072amh6/lijitefileperidebefezajar.pdf
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16074ffa5ab128---96363904415.pdf
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/0tthlomh7k79q3j479n8m0ivtb/kalososavofubikeg.pdf
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160969d1c5ca46---73524744477.pdf
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/c574ea448b7d446e6191b3baae6716b4/moriboxegimalugunefinax.pdf
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/c57d6014d2a19a20893ed2cfd2c99ee7/xoteradegavogimudigasi.pdf
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608ef91c5138a---90044129155.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011fd1.bin
2be99eab9c1fd9da953b615d4d2d5e40c4d6d7234aeef84263cb59088fbc844c
pdf-font-stream PDF embedded font (sfnt) at offset 0x11FD1 10608 bytes
font_01_sfnt_off00013841.bin
fd494554c7a7a2c4488382a78096c535ff133766c7221992be4f6a58596b2467
pdf-font-stream PDF embedded font (sfnt) at offset 0x13841 16164 bytes
font_02_sfnt_off00014db3.bin
38aebc8c90a3276ee0dfcfbc6f810e21c00d3298268bdff1f572451db66fc4c1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14DB3 18392 bytes
font_03_sfnt_off00017e15.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x17E15 16792 bytes