Malicious PDF — malware analysis report

Static analysis result for SHA-256 40fc353c7710696f…

MALICIOUS

PDF

89.5 KB Created: 2021-09-08 23:34:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 1252119c2d718a72ec8d57ef28d6bddc SHA-1: aab994f7c686ea8ad8259c314b678c25b5d73a42 SHA-256: 40fc353c7710696fdc6f5bc05e62a68fba442eb6f146db5c98bf9013fbbb1a2a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised WordPress sites. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9761

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 https://kiptep.ru/file/81706533556.pdf In PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135658786922---bavasubifiw.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613784e7496d3---86657041115.pdfIn PDF document text
    • http://myoffice2561.sesao33.net/UserFiles/File/dafekoxeturuzaje.pdfIn PDF document text
    • http://snuhonors.com/userfiles/file/51535107712.pdfIn PDF document text
    • http://air-ned.com/uploads/files/10137176330.pdfIn PDF document text
    • http://adgroup.co/userfiles/file/xuvefemab.pdfIn PDF document text
    • http://freewest.at/duzur.pdfIn PDF document text
    • http://robotsuk.com/luckingbros.co.uk/userfiles/files/tukol.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/raluludexepemowisakevu.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138e19babca6---45619287944.pdfIn PDF document text
    • http://yugreat.com/filespath/files/20210907232018.pdfIn PDF document text
    • https://willmarareachamber.com/ckfinder/userfiles/files/levijaxem.pdfIn PDF document text
    • http://bephoangdung.vn/uploads/ckfinder/files/forejezaz.pdfIn PDF document text
    • http://gespk.com/userfiles/file/76875462941.pdfIn PDF document text
    • http://lnshiyue.com/userfiles/file/20210903114445_428743618.pdfIn PDF document text
    • https://togelunited4d.com/contents/files/monagovojorubonideri.pdfIn PDF document text
    • http://vasset.bg/userfiles/file/44869732752.pdfIn PDF document text
    • https://schmitz.cz/res/file/68072594691.pdfIn PDF document text
    • https://www.andreivieru.com/ckfinder/userfiles/files/xaxidesobosi.pdfIn PDF document text
    • https://bi-kiesabbau.de/cmsimple/images/file/dezekamanubeza.pdfIn PDF document text
    • http://bdn10.cz/files/file/rovaxinoropasuki.pdfIn PDF document text
    • http://vidol.nl/userfiles/file/fowixuworakemujit.pdfIn PDF document text
    • https://jmbarrenetxea.soinuenea.eus/files/galeria/files/vasokerenukasujaganexuz.pdfIn PDF document text
    • http://myxroad.net/upload/userfiles/file///lugeguf.pdfIn PDF document text
    • https://eventpro-kontraktorpameran.com/uploaded/files/71876286130.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=android+internet+payla%C5%9F%C4%B1m+program%C4%B1PDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A2 18512 bytes
SHA-256: 5d90181d007e084919b3ccc86f9698eeaab677cd12784505e6ab5df0ab8529ff
font_01_sfnt_off00010e63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E63 16140 bytes
SHA-256: 00b1f632e8afe72716c8bcdb76b7901b56c060d1dc0f96f3f5c1b8373b85735b
font_02_sfnt_off000123df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013bf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BF6 10952 bytes
SHA-256: 5de7d88fed4542fb3de249f17216f22aa4d9cf2bf1702b9b824e11633fec8523

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