Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f1de3a943b89cd8…

MALICIOUS

PDF

107.5 KB Created: 2021-06-29 01:13:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c4d2ed94732a53b6e9fb036d844d9371 SHA-1: 1e2772f0c2dba19687aa81f45d110507a7789a75 SHA-256: 9f1de3a943b89cd82d0fb55fe33c0a499c6aa5d606c8f5e86fd97f279c1c473f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a link farm pointing to compromised WordPress sites, which likely serve as a distribution mechanism for further malicious content. The presence of multiple unknown URLs hosted on these compromised sites suggests a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab50291338f---xerejanazu.pdf
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074a54c7676b---dolujiwa.pdf
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/e7c06b65cbc4eea0ae2aded7c05aec20/66175198178.pdf
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071f5b70b958---43515308789.pdf
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/d7df5fd35b6d31b45ac6c708f5a98f7c/bopaxu.pdf
    • https://juhaszautovill.hu/userfiles/file/90802682947.pdf
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/872b3b8aecfd64704426da8860d98b64/balajexopaded.pdf
    • http://propertiproperty.com/Uploads/userfiles/files/57312437033.pdf
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160736843e09ce---64957013632.pdf
    • https://www.elitelawnsolutions.co.uk/wp-content/plugins/super-forms/uploads/php/files/51nngsin1d3mtbkelok7knsvcb/bizoxinomosubena.pdf
    • https://anpheatingandac.com/nbloom/fckuploads/file/wakuvanexesopik.pdf
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/cce9e40ff24e2114c54ceb2de075b11a/pebesafobipuputazek.pdf
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c5f468a9ea5---vamotesuju.pdf
    • http://vzwsportenmuziek.com/content_docs/53324035451.pdf
    • https://dukra.sk/editor_uploads/files/dixazepili.pdf
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c70ba56702---99172794525.pdf
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160c03591eb3b0---80254723848.pdf
    • http://studioarchperissinotto.eu/userfiles/files/30614614559.pdf
    • http://dogalakustik.com/depo/sayfaresim/file/63952110509.pdf
    • https://cgeminfos.ma/upload/file/fukubokali.pdf
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607770a47fa48---42129092216.pdf
    • http://cameralehiep.com/hinhanh_fckeditor/file/mupogusalefuzidil.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=streaming+film+fantastic+beasts+the+crimes+of+grindelwald
    • 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_off00013bfe.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13BFE 16792 bytes
font_01_sfnt_off00015410.bin
3e006d66be54988b080d9a97b6c1306eb98bcc8b9ff333281affe345ba2b7c6c
pdf-font-stream PDF embedded font (sfnt) at offset 0x15410 19124 bytes
font_02_sfnt_off00018636.bin
e023a8b4279e134801e88456932f87faca0a94546107c7709088c7e6b1b9c3f5
pdf-font-stream PDF embedded font (sfnt) at offset 0x18636 11224 bytes