Malicious PDF — malware analysis report

Static analysis result for SHA-256 83cfd93c850bad3d…

MALICIOUS

PDF

92.6 KB Created: 2021-06-28 10:49:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2ed9ad157161dc4093ae84413d100df7 SHA-1: ca7bb1f23f9e4b2cf5a6b53c6cd00ef58720cde9 SHA-256: 83cfd93c850bad3d5bbfe534fcc5a8b56ac7ab48ebb5f4190320dea03798c97a
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to compromised WordPress sites, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing pages or download further malware. The presence of multiple links on disposable hosting and the use of UTM parameters further support a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5efa1077be---bafamuzesoguwari.pdf
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb8e69435c---pilavowamekerewituze.pdf
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/7mtrkajsdhvcbbgq2lmf087qj5/99961128015.pdf
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/57e48a191a9a73da2d29019a89c64b7b/bagokumirogemafabatokilet.pdf
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/66b8311678415880269e2434a07f9365/puzixabid.pdf
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9cff74425---pogokujuxibilerotonizixiv.pdf
    • http://omeofest.eu/userfiles/files/dapigaxisaw.pdf
    • http://championshipsportsrings.com/clients/23492/File/jefelulemifatifewugojik.pdf
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c16957d5889---84556881509.pdf
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160923f3b3458a---jowuboguwokuvezuxukof.pdf
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607fabbc4dc50---gajazerubu.pdf
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/1737fdd62c1a0f89d3ea63cd6e6da504/xesivisuwilasevula.pdf
    • http://tuzlakart.com/files/lofazipatojubaxaf.pdf
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/9uaopjbid6o93jlroa1hkti7r6/5819748853.pdf
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/9b175827f231cd24e43624030c6a3dd6/9587794443.pdf
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16092af418717d---mikotunesa.pdf
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/2194c9c4a5e3f4ad6e6342f86ba13556/benajodirenutewoj.pdf
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/839a33fb383205329d27acfda0cacce6/fenubixipoluziruzazuzo.pdf
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a618cf793ec---11188576520.pdf
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/34b267a5989ec4dd7883f170be505f48/mopogufikavatoririkala.pdf
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/3d3be7886302c4415ac01d6765376dd0/45697038077.pdf
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/ou8ardlpiu15titd68evb8hj11/fekavegipezeje.pdf
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a656ff130b2---99632262066.pdf
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4cbecab7c0---jubusasudasawijixa.pdf
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/16073bf12d7395---55201602038.pdf
    • http://quickvideo.nl/userfiles/file/67619879333.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=american+female+news+reporters
    • 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_off0001084e.bin
5f8eabc49ab080f2eabd705a0512d98523712b9710d120ee416e7aecb218a1f9
pdf-font-stream PDF embedded font (sfnt) at offset 0x1084E 10708 bytes
font_01_sfnt_off000120f3.bin
03a6841b9c49ac3b6b175991d7b29cb8271601f57c0a7542926b54ac280e5691
pdf-font-stream PDF embedded font (sfnt) at offset 0x120F3 16948 bytes
font_02_sfnt_off00014d02.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14D02 16792 bytes