Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1dd53cfd916c628…

MALICIOUS

PDF

95.9 KB Created: 2021-06-27 20:51:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9b4417ead9fa829c8a64373a754370fc SHA-1: 2be9d9244e5154d3f0bf0a7e88054f689e802ce3 SHA-256: f1dd53cfd916c62806e6adb10e2942e48cffbce69f4ef78bfd394c74fce6e8f5
196 Risk Score

Malware Insights

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

The sample is identified as a malicious PDF by ML classifiers and ClamAV, exhibiting characteristics of an advance-fee scam. It contains numerous links to compromised WordPress upload directories, suggesting it is part of a link farm designed to distribute further malicious content or phish users. The document body, though heavily obfuscated, aligns with the lure of a lottery or parcel delivery scam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc3d4ea6f1e---xiziwabuwel.pdf
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074686683d30---mujade.pdf
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160adb17a42dff---81141409147.pdf
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/1f4188020407d97884e940b6732bfd23/jeponezolisasakofotof.pdf
    • https://soudurelausiere.ca/upload/editor/file/85129008268.pdf
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/nhmhkdhogfk8dc1p6e5evdu4ct/wuduninetaxomigowokutuv.pdf
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/s7uoc7v3edam602gc7am1ccd01/21795952109.pdf
    • https://apotekatia.ba/fajlovi/28955365903.pdf
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c76fe14e5f---gifewesupinakidamo.pdf
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/7a148ffeee83739c1b544e1fa998d4eb/45079211534.pdf
    • http://anhuishangbiao.com/upload_fck/file/2021-5-5/20210505050446621742.pdf
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/7ad02ce09f6b280650dbd1105c3e91ef/megebumunel.pdf
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/4c3a86f7a029fb6444d971c732a949c8/xulolatizeluxi.pdf
    • https://palcev.ru/userfiles/file/pagetituw.pdf
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160beb0a6c302a---nodenuvimiwegegekojudele.pdf
    • https://wulf-sanitaer.de/wp-content/plugins/super-forms/uploads/php/files/3seq5kle7cilj8rahbk02qq9dh/lavukujanefu.pdf
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/fac675e46d75386d56890b9a5135036f/nunagirugaxebukeponajigi.pdf
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16094dc8fa4f78---nigevinafakituvazudepu.pdf
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/bf22683be20534007d34b24224ad9e5f/59005810272.pdf
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/cf6186ad559ddee8bf69858ef684f7c0/lanija.pdf
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/tf04vs7olldlbemgb4ktikbu4g/74054452998.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607373cbf06c0---xivuleronagigakuperipe.pdf
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ad89c36e5f3---21656708184.pdf
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606d246f7239d---94551396743.pdf
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2ef70439e7---zofizekinuf.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=n7+music+player+pro+apk
    • 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_off00011394.bin
969058a32c19f41c756bcb718dcda84265e8dda674d38d577507f488a4ca365b
pdf-font-stream PDF embedded font (sfnt) at offset 0x11394 10664 bytes
font_01_sfnt_off00012c1b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C1B 16792 bytes
font_02_sfnt_off0001442d.bin
5d33fb84bc7e13b161fd71d29e85be2bb213c12f5e56bf93804f8a6a1c2cf3e3
pdf-font-stream PDF embedded font (sfnt) at offset 0x1442D 17748 bytes