Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb7b3c8824fae793…

MALICIOUS

PDF

115.4 KB Created: 2021-07-13 13:11:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2b3019397f52829727e6792a81e59474 SHA-1: 7a61451f71afaba36a9212fd72a0ef99e5d2481d SHA-256: bb7b3c8824fae79309c14968f94e8d1fcf2bb3d2110419f572695798656ba236
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS upload directories and disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. While no scripts were explicitly extracted, the nature of the links and the PDF's structure strongly suggest it's part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://shop-cartuning.pl/userfiles/file/fudotupipipipa.pdf
    • http://hertzlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/revige.pdf
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/36743a3b04402fae2791a1c630ff6b1e/56645991727.pdf
    • http://yjccnc.com/upload/files/8607115973.pdf
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/od91ijkeocvrh222d4tb7lmjli/rirelerar.pdf
    • http://krakow4you.pl/krakow/files/luturerapaxametebixaregax.pdf
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0425fea66e---6044565513.pdf
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16085065569f57---komukoritexosirabikiwi.pdf
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/rb1r15048hu87cqf79nlp0ir46/89081684572.pdf
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16086d14922b0d---jujow.pdf
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/14be8090ac1db55f66621133af6a9299/1294675179.pdf
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/739c41f368784dae5ccd24cb35a0dc34/tifikud.pdf
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c5cbc4a0858---sadegodimekamoki.pdf
    • http://boxerdapolenta.com/cmsimple/images/file/tizogekiwaruwexitawowim.pdf
    • http://bfr-bialapodlaska.pl/userfiles/file/xuvudawulemowowegabe.pdf
    • http://baggiez.net/userfiles/file/terefusabiji.pdf
    • https://stgeorgedentalcare.in/ckfinder/userfiles/files/febulutaloxajedexoselakam.pdf
    • http://sieuthihatgiong.vn/webroot/img/files/selulabutiguwikabig.pdf
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/8r170sfhoci578i8l5anavrlv4/23480579197.pdf
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/e2dirfgjb6fiji25ob63feid2n/welapabekuvuzowota.pdf
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/ag3n1t6qt4ij8a8vgcus81hqb5/buvufinasidedokigone.pdf
    • http://palyavalaszto.hu/teszt/upload/file/25766393788.pdf
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16089c4545c2ce---35854702588.pdf
    • https://burstallconrad.com/editor_files/file/livadodamamiramopu.pdf
    • https://stpeterscbs.ca/ckfinder/userfiles/files/bediruderedelawumabelowev.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=1+tbsp+flaxseed+meal+in+grams
    • 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_off00015edf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15EDF 16792 bytes
font_01_sfnt_off000176f6.bin
3de73d6add3caac8a3222d57ca790713c50fa5db26426d030ff9afab4ed4a42e
pdf-font-stream PDF embedded font (sfnt) at offset 0x176F6 10920 bytes
font_02_sfnt_off00018fcf.bin
5a10762af3ec034fbfd08ad17d6a39c2cbed03d2653773cc0acf9e60226711f2
pdf-font-stream PDF embedded font (sfnt) at offset 0x18FCF 18400 bytes