Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8038ce6cf83c51c…

MALICIOUS

PDF

86.0 KB Created: 2021-06-27 09:22:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 44f0d8e90bf5b169932d03b88e26ab15 SHA-1: 0358fe737dbba0eea0662d4c0eb1c0eed6d927a7 SHA-256: c8038ce6cf83c51cf898c52c872788a831ac8de2fa9cc66ac362fff5bffdc882
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised CMS upload storage locations and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of numerous unknown URLs indicates a broad distribution effort.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://aartipalette.com/userfiles/file/zapudofi.pdf
    • http://hydrogears.com/survey/userfiles/files/kuziwugo.pdf
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/379823607be732fc85349130c085e0cc/40312813684.pdf
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/7ab223e6d927119e99129011f92b05ed/58433664851.pdf
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/9221700aafa0b3aa2ff7d8bd7450169b/xojotelug.pdf
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/4d3b9908cf192d6d745a5d8709fda6b1/dotubiwusolagefejuwuxum.pdf
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608111203c158---kikupawujogotekekaxine.pdf
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609421a38efee---70664208636.pdf
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/a9576c94f4fe86bc64646c96f3257b70/40386148371.pdf
    • http://asbazainville.org/userfiles/file/xizizifepasuw.pdf
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ba38b0f975---nudodevunobujove.pdf
    • http://caopump.com/admin/userfiles/file/pifubupenatimika.pdf
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ba59c05229---18727090774.pdf
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073f4a92667a---76970275131.pdf
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160c29d6be8ae6---72947934974.pdf
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a92d2bc4d9c---31393828664.pdf
    • https://akapacha.com/userfiles/file/bugizelijuti.pdf
    • http://nuestratierrapremios.com/campannas/file/putaxuzi.pdf
    • http://annjulieskarpmo.com/userfiles/file/vonirazavufobodalip.pdf
    • https://prastosten.se/anvandarbilder/95/files/lepim.pdf
    • http://gopherandsquirrelcontrol.com/admin/images/file/31489248088.pdf
    • http://ahs1968.com/clients/d/dc/dcea35c349c70fb55dca458fc6558ff6/File/dukivunuzofigaje.pdf
    • https://www.bistro-e.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079dd54c0c03---63309257182.pdf
    • https://boumqueur-edition.com/upload/fckeditor/file/lesuzinuxamotivagipuw.pdf
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071aa370e220---10768475311.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=body+aches+during+pregnancy
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085fbe90181b---48896789721.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_off0000ee62.bin
d5ecc24bc8a66b64a5849945b5cdef7f5b8512942fb45a10e9f6fea739fc58f4
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE62 10916 bytes
font_01_sfnt_off00010769.bin
f5563f192eeff98460e1cbacbd80cdc2651d41e3034429030cb69caec0bc5287
pdf-font-stream PDF embedded font (sfnt) at offset 0x10769 16620 bytes
font_02_sfnt_off0001327a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1327A 16792 bytes