Malicious PDF — malware analysis report

Static analysis result for SHA-256 4017036c2ee78ec1…

MALICIOUS

PDF

88.6 KB Created: 2021-07-19 13:48:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b4e0d65fbeeab4abe413139c9d560983 SHA-1: 890a33d5a52365bed8b76a488c1f4f67048a12a5 SHA-256: 4017036c2ee78ec1d9797f00ddcd38e2b2f0968fd7cdbb6ca1e7be79a2a90edc
196 Risk Score

Malware Insights

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

The sample is a PDF document identified as malicious by ML classifiers and ClamAV. Heuristics indicate it functions as a link farm, with several URLs pointing to compromised CMS upload directories and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The 'SE_ADVANCE_FEE_SCAM_LURE' heuristic strongly suggests the document's content is designed to trick users into paying fees for non-existent prizes or parcels.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609d6026a0efa---bitizomolubokip.pdf
    • http://mopron.ru/upload/files/bimesin.pdf
    • http://wskinbody.com/data/boardData/files/34650757930.pdf
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c698e3d1e6f---pirapa.pdf
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160986f95b642e---97892446193.pdf
    • http://mega-stainlesssteel.com/uploads/image/files/fifubomulesixaxuk.pdf
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/d96no3seudeafk8ujs1hidsta5/22764751220.pdf
    • http://www.tokyomagic.jp/images/library/File/jegazotibajad.pdf
    • https://marathonroller.com/userfiles/files/rinoganejot.pdf
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/48vft4h5anomjf4nrq4f0d8vc4/bonajafukoxirafinimabip.pdf
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c619b026dff---58267439296.pdf
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1eafc4f7a---6497945685.pdf
    • https://aymfly.com/aym_image/files/36690920983.pdf
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160803aede2a86---73059189954.pdf
    • http://chonburi33.com/userfiles/file/92094614206.pdf
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086ddbd58b1a---widifefugekifolofutapota.pdf
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2359fb83e8---57485211519.pdf
    • http://qiangka.com/ckfinder/userfiles/files/gabivuzuxajopofivis.pdf
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/207d4ad043739a56bc900977d851feec/68776336165.pdf
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/4ea0a985b3b2bca903a9c190cf36f503/70193783805.pdf
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/83ff08e145b109aaf9c7e4397602a1ab/98971584324.pdf
    • http://fioredda.com/userfiles/files/dixuwovujibataruzaradudos.pdf
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/3ofp75td2rb6g0pjaajht0f629/vasesa.pdf
    • https://abicecream.ru/ckfinder/userfiles/files/jarugakenemar.pdf
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/gkj0vf2b56kls87kmo77v5c4u8/zigejituxudepojasulofik.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=number+5+flashcards
    • 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_off0000f7d1.bin
13955ec36c93baba821c9883f7b0a0cfea48f0608991bcca0247c3ec4f0afb4c
pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D1 16776 bytes
font_01_sfnt_off0001232c.bin
1af16cc1d7c0ff8b77bccdcad4c84a5243efd087b4531d1ee05ca3b33598e91d
pdf-font-stream PDF embedded font (sfnt) at offset 0x1232C 10680 bytes
font_02_sfnt_off00013bb2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13BB2 16792 bytes