Malicious PDF — malware analysis report

Static analysis result for SHA-256 87726b8535982fb4…

MALICIOUS

PDF

96.6 KB Created: 2021-07-21 13:12:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3818a6a3ae9b1e926ac41739d2511031 SHA-1: 158c06b641c74e22b2fee472daad300bc8677a53 SHA-256: 87726b8535982fb49a88a0183687b6c1400ed42b32ff71c4a0be7ff6a8f97f40
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. ClamAV detection and ML classification strongly suggest this PDF is malicious, likely serving as a phishing lure or a distribution point for further malware. No scripts were extracted, but the structure and URL analysis are sufficient for a high-confidence assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c58cd83d17e---95627998326.pdf
    • https://atpl.aero/ckfinder/userfiles/files/salapimipalovapesuw.pdf
    • http://onishi-kyosendo.jp/archive/lewesewiritebovunomegiso.pdf
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/b57e4a6b88b16eb2d98e955e711b6962/tibaxagolaxesi.pdf
    • http://abwalabamaave.com/uploads/files/26355955083.pdf
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/ef7105ebfe564c75356709566b1790e4/vituluguw.pdf
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609da8f29e790---nuzovedosezenaro.pdf
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf9eae20005---sibigafekuga.pdf
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/0436fe21c25f162eff69053a61624927/42107433832.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a761d31910---xataponeke.pdf
    • http://evola.it/userfiles/files/dijimufubawipaxaror.pdf
    • http://arniestribu.com/campannas/file/revotitamujimeso.pdf
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160839e7fe6366---28745847310.pdf
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/b3e0faa69c950a35546d430ae43cb77a/92992087205.pdf
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/1608db23951abd---sifamizivolopusez.pdf
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca23025755---sekaparedufu.pdf
    • http://roxburyhs1987.com/clients/63080/File/zigasadot.pdf
    • http://champagne-marc-chauvet.com/images/files/40067088226.pdf
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/9962f6a3c714088f0af0662674f8cc22/73530625068.pdf
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160785413dfaaa---79674219796.pdf
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608404e858595---96943611044.pdf
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/5fa0859206cf57d70978e55aa1377337/waxoxulaxapede.pdf
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/a610c5bb518d8b6f13ec3623830c460f/7844870436.pdf
    • http://indago-rovigo.it/userfiles/files/vobifugo.pdf
    • https://cmoretv.com/userfiles/80347405682.pdf
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/dbe10f0d2d3f8fcded4909ba62eebbd8/36688267027.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=leg+cramps+after+exercise
    • 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_off00011a5f.bin
9be8f726c3a43bc393a8750a4d60f98411e3d09d65e802a3025f34efba4bfecf
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A5F 10612 bytes
font_01_sfnt_off000132ae.bin
e706701e23b76004ba87e74309b6c9bffdfd2bd2b08436b960501f3f9e5f9128
pdf-font-stream PDF embedded font (sfnt) at offset 0x132AE 16388 bytes
font_02_sfnt_off00015d13.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15D13 16792 bytes