Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3e895276a97857d…

MALICIOUS

PDF

85.4 KB Created: 2021-08-16 22:20:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: bd684499eec5cb044e2823b85fb8174d SHA-1: f8600a4b41cf4b47cf8e4273e54a7c7b8c1c46b1 SHA-256: c3e895276a97857d883275a1d3dbcc14704095fa83a8a54fe80c6ab21ccac88c
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The document body is unreadable, but the heuristics strongly indicate a malicious intent related to URL redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://suamayin.biz/userfiles/file/52701938896.pdf In PDF document text
    • https://rijst.nu/userfiles/file/46157465125.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/514151c62574f7b5f0e3bb6e2eb348d8/netinuliduka.pdfIn PDF document text
    • https://bookatowncar.com/userfiles/file/97281881959.pdfIn PDF document text
    • http://locthanhroyal.com/upload/files/mobiwaxofifeledusij.pdfIn PDF document text
    • http://menloathertonhigh1980.com/clients/6/6f/6f83464fe0b13873896cace574d4baa5/File/99087143736.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/fatuja.pdfIn PDF document text
    • http://studiogalata.it/userfiles/files/xipojalatagowisezaxupu.pdfIn PDF document text
    • https://polresseluma.com/assets/ckfinder/core/connector/php/uploads/files/vavaxobenisudejil.pdfIn PDF document text
    • https://mmszke.hu/files/file/lupivaxizepafefuxiv.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606d7f851ece4---65519600505.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/bf11b62d51ead60c999e413d2ac17878/majogi.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609abcdd9a519---16064004892.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3b622272a---41417768479.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/8ada7f2ccd7e32dd2474c9448144fc6a/57999980586.pdfIn PDF document text
    • http://mazdooradda.com/userfiles/file/maxiteralijikuvinomibo.pdfIn PDF document text
    • http://manavpublicschool.org/manav/userfiles/file/58955873867.pdfIn PDF document text
    • http://mientrungland.net/uploads/image/files/bimalopenurelezalup.pdfIn PDF document text
    • http://mh-gartengestaltung.de/userfiles/file/bodinawenurudurowesa.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/161185b66dd3eb---wususixumazezidunajolulok.pdfIn PDF document text
    • https://sicurezzaips.it/uploads/file/99905082014.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/kovenuzapoxij.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/79287280387.pdfIn PDF document text
    • http://zzliuxue.com/upfile/file///donixutanafivakoxuvupikob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=hp+officejet+pro+8600+parts+manualPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B8 17296 bytes
SHA-256: 9c2393d6ebef618aee8266267381afc9ed2ffa3918d86e9a1e64cb65279da7c0
font_01_sfnt_off000113fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113FB 11360 bytes
SHA-256: 936bdf76836e303fb6729f38500116b705d13ccb45ed7ebd86d5c6d00f3bb6e1
font_02_sfnt_off00012ea9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1