Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4a26da8ae97796b…

MALICIOUS

PDF

105.8 KB Created: 2021-07-03 11:30:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d4c54eb627259055c18c709792f0c349 SHA-1: 4c4951b117908f744fbc7cc7c50ed4383300ceb6 SHA-256: a4a26da8ae97796bbffd08ba577d70ecac9c6dfd71f4af09a2a52fc7d601bb4e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URLs, many hosted on compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the PDF structure and URL patterns are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9773

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://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/42059f4ee268e08e5c579cb1e3980fe3/gidefodosumevopenukaj.pdf
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089de45e3a0a---38801959419.pdf
    • http://derkwoo.com/upload/editor/files/fuvamokofabiwebonewonoro.pdf
    • http://18554080.com/userfiles/file/31634000882.pdf
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bec6b4b1856---45904865660.pdf
    • http://emotionpicturesfestival.gr/userfiles/file/91600387359.pdf
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/fmv3dh4advp4jth81m4sqisqs3/kulopagifozivetez.pdf
    • http://seoulmenu.com/uploads/files/wibaxi.pdf
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078cdca3f428---rogasesafuruseki.pdf
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/a73afc3c57aac7518dbf24aebf70ef5a/54465296873.pdf
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/a456e2c934e5332ce0d78836c453d944/63875960931.pdf
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a04a7aee840---13681534849.pdf
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/67bca8e6d51168208a6b45c3f951b4ed/95561160768.pdf
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/7p8bsra1h5uhn1tkenvlirdalr/nasipuzifegezemovaziluzot.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/a1d0be2719f4516676755b69d8a707b8/kewabexowumijo.pdf
    • https://locktactyuma.com/ckfinder/userfiles/files/vubanewegaj.pdf
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/01e7f1e4e21fb331ec01741179ad7516/55680040752.pdf
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/4b0cce738111c8051b9779b4333e194e/gajekem.pdf
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079f89908e59---juligilajaka.pdf
    • http://bioident.pl/photos_fck/file/42277502915.pdf
    • https://actorconseil.com/files/file/63352975295.pdf
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/7adc142a2352a5523be8ad543f165dfa/xagenojewaz.pdf
    • http://www.abcklima.hu//data/editorfile/rexataf.pdf
    • http://1960vonsteuben.com/clients/d/df/dfb5e1b83ea85bfdc5ef1da934264264/File/39959662978.pdf
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/4jrslr0chp9elbukklqifj1r4k/28137871118.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/idi5o1qgaccgrnkq4srrhgput2/romigujavabupuda.pdf
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b88a1452513---vupowalojopuwefofutal.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=the+road+chief
    • 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_off00013ba1.bin
a2b8bfdf89a1b6df6dc58abe08191c4b766c7e5843a643f039a9a7e5522daa73
pdf-font-stream PDF embedded font (sfnt) at offset 0x13BA1 17708 bytes
font_01_sfnt_off000169e2.bin
a27ca8853c3cc5a586a301566babf407a20528692b350ebc5c49086b3a29e8b2
pdf-font-stream PDF embedded font (sfnt) at offset 0x169E2 10120 bytes
font_02_sfnt_off00018092.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x18092 16792 bytes