Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3189bacc82791c2…

MALICIOUS

PDF

86.2 KB Created: 2021-06-27 23:50:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f6cf23e12eb00f82c388a7a10bb51cce SHA-1: 2303b47835c5248b844cbebbb5b09042935cc197 SHA-256: b3189bacc82791c2e2f88a98fa200ffba2321a8123d7a9e57ae5ba10918b7059
156 Risk Score

Malware Insights

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

The PDF file contains a link farm, directing users to multiple external URLs, some of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL analysis point to a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bce497553e7---24881037191.pdf
    • http://wrhs1967.org/clients/6/61/617565fc8afb9cc6d18abf932d248b7a/File/newaxubilesogosigefasoz.pdf
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/7004rk80tr8k6mak5qknr2h4d7/kemuduxew.pdf
    • https://saunadlaciebie.pl/userfiles/file/71064314075.pdf
    • http://palami.by/images/file/nodol.pdf
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/b44eb293e8883a844e9e83da1b62d00a/bopudenafifusuzujejov.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/37a14cce5b2a2c18a8f825f1dc9c1a85/devovetugig.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9ba2d27fc0---zotobalivemipibesadu.pdf
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/u0vi3bmcarmqs026s7a2fs9cs0/pokirexidizelefulixomago.pdf
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160bec33dd72f5---89455589402.pdf
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608c0bce8a512---fabolulalomosijozopo.pdf
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/0478f5c861527d78caf4a0abfdc49a04/vusodajev.pdf
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed5d1b6206---40911027332.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160855d92ac725---xegifogutumoxejam.pdf
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b55b3ff66---jawamidiwudedidetunuda.pdf
    • https://aashianarealty.com/file/47790089814.pdf
    • http://beiks.info/public/file/pezonedorepuxiv.pdf
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/739bf1cf6fade1ec248956ceb32cf8fd/xesomubokifupasevonaxo.pdf
    • http://mcgrathpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zelojazotaxugeviboven.pdf
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609219f27c413---59528603346.pdf
    • http://goraku-sangyo.com/userfiles/file/tisepowadadaj.pdf
    • https://classykitchen.pl/web/uploads/files/kobapawufumerudebufi.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa9faef6ec---21977872713.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=if+i+told+you+it+will+only+gonna+hurt
    • 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
stream_002_off0000cfe3.bin
2d1430f346922f25b552a8d0b82fdd58c87266fdc7bce8066d84a24ef68b6243		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xCFE3 18680 bytes
font_01_sfnt_off0000ee51.bin
7e76b25131bf3a4c141e2b4d2861a48e1f84e994f2ef8e03ad4413ff20fae21a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE51 10584 bytes
font_02_sfnt_off00010633.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10633 16792 bytes
font_03_sfnt_off00011e45.bin
bdf4ebc71af03c791970a7011cdaae7a28262f6d6c3b28c0a4e83db10242c66a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E45 17672 bytes

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