Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc88984b1a7d0894…

MALICIOUS

PDF

82.9 KB Created: 2021-08-05 03:44:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 722449ace6e612895288f8468ba0412a SHA-1: 6dfeeb4ea18b53bffa31312fa85bf44d4489a559 SHA-256: fc88984b1a7d0894941a9eeee55500fe98bd64b753e0bee9ead13d3492aef506
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm or redirection mechanism. The presence of embedded URLs and the overall structure indicate an attempt to direct the user to malicious external content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://crewmak.ru/uplcv?utm_term=passive+vs+active+voice+exercises PDF link annotation
    • https://asiarsolutions.com/userfiles/file/55278310144.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/b2abbc33733ecfacf1b95699bca4b57c/51539710515.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/1d1b572b8a90dbc59eb36d88a81813d1/79493918248.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/m4ufmja4snue4ve5duqr29s495/vigusagegagowixese.pdfIn PDF document text
    • http://suarezbeltran.com/aym_images/files/76449734247.pdfIn PDF document text
    • http://fcvperu.org/data/fcvperu/userfiles/file/21881300792.pdfIn PDF document text
    • http://grgct.com/ckfinder/userfiles/files/55139827109.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/rahbcdhdm1b5rju16uer17lc03/15727141054.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/ledox.pdfIn PDF document text
    • https://cristalparkhotel.com/ckfinder/userfiles/files/96571388271.pdfIn PDF document text
    • http://jarauwerdaenzn.nl/userfiles/file/26584107265.pdfIn PDF document text
    • http://theettiares.com/clients/f/f0/f03dfc1790708d0b03c48e9879ef2ea6/File/99811643161.pdfIn PDF document text
    • http://aylincinarli.com/fckfiles/file/44659669927.pdfIn PDF document text
    • http://asbazainville.org/userfiles/file/jovisunegugebodap.pdfIn PDF document text
    • http://borisovhlebprom.by/var/upload/file/kikipon.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/88139246103.pdfIn PDF document text
    • http://handsonmontessoripk.com/userfiles/files/19811825386.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16089ae2049784---zisonijikobuxowaba.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a04a325c64---80995427830.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/810f4p3mblrjb4nj4jk0tnn6vi/21472282383.pdfIn PDF document text
    • http://www.szphotar.com/admin/img/files/bigipalenovajake.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/t286q9ajd79ov6a5egaa0f8ean/94200920638.pdfIn PDF document text
    • https://www.marjojaspers.nl/ckfinder/userfiles/files/37183434827.pdfIn PDF document text
    • 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_off0000e1de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1DE 16696 bytes
SHA-256: bc89b6af8e69d52cce0d3c683d34cc131bbf2f412693a859db192176635ff2d5
font_01_sfnt_off00010d60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012577.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12577 10240 bytes
SHA-256: 86aa1f8c6250fe7f51e04129d2e129efc9a1a945b4b32390962b61e06ddde4c6

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