Malicious PDF — malware analysis report

Static analysis result for SHA-256 86b010d031b0a36a…

MALICIOUS

PDF

84.2 KB Created: 2021-06-26 11:42:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 390a6829a4514a32e0dda2b86491f753 SHA-1: 61d8bf3772fd31f5a72f1b6f5ef0def267e901a8 SHA-256: 86b010d031b0a36a0ca7d8a8c2b57a264c478949d8e58ba639f32ea70343bfe5
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious. Heuristics indicate it's a link farm and an advance-fee scam lure, likely designed to trick users into believing they've won a prize or are expecting a parcel. The document contains numerous links to external PDF files hosted on various domains, some of which appear to be compromised CMS uploads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://triatlonbizuterie.cz/sites/default/files/file/fuvedove.pdf
    • https://altinhediyeler.com/calisma2/files/uploads/26311755031.pdf
    • https://edu-mate.kr/_UploadFile/Images/file/90220607659.pdf
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5252f0a50---webejamepodika.pdf
    • http://s-privod.ru/userfiles/file/39486793480.pdf
    • http://rzn-house.ru/upload/file/80459740280.pdf
    • http://yossy.biz/userfiles/file/weduvuzomitumunuleledu.pdf
    • http://cdkkck.com/uploadfile/file/20210610123520.pdf
    • http://bollywoodsalonskokie.com/admin/images/file/bimuxagif.pdf
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c010f8a46af---69604407909.pdf
    • https://webmenuplus.com/images/file/netulu.pdf
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/12f62bab490c44e133d936e9d6a86aac/22594420496.pdf
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/p135ofb10k4ck7fr2f3sran6b6/61719259876.pdf
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160ac5ac2dd190---37603856954.pdf
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/b72ed4853eea5c43c0f2de57b64682b4/makifewilonefiximut.pdf
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/db0cbceb97724705241acc9930b5170d/48321380569.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/c91852bc058a7635d390a09a9e2486de/93556493298.pdf
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/574e73573bbdcf7a89782ed03ad92e7e/30203414550.pdf
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/d174a0d80ab8b3d912c9017d3ef403c7/97908967369.pdf
    • http://zovsh.com/Uploadfiles/files/bebil.pdf
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607fcd4008321---lomufo.pdf
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b8887e01d12---kotanijegunuvarunetuboku.pdf
    • http://jar-ted.pl/file/59833487962.pdf
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160aeb42101d77---88824350264.pdf
    • http://jtour.vn/userfiles/file/11030278890.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=sunset+limited+cormac+mccarthy+pdf
    • 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_off0000e145.bin
821978d1d56cbf47b5e535f75f436fd8c4242e67dbccc38bcfb6fcf6deff7481
pdf-font-stream PDF embedded font (sfnt) at offset 0xE145 11176 bytes
font_01_sfnt_off0000fb36.bin
6c82a4a8a284c2cb41e9fdcb9b6bb7916bea3185acdbdd860043655d26d81226
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB36 19560 bytes
font_02_sfnt_off00012b89.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B89 16792 bytes