Malicious PDF — malware analysis report

Static analysis result for SHA-256 acca3b317953e641…

MALICIOUS

PDF

87.6 KB Created: 2021-06-27 15:50:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d5da458ed29feb36c815c30dae84dadc SHA-1: 45d0c31e1e71542d97e970dd904b7c3922b04a0e SHA-256: acca3b317953e641ffb4566c729327711ffd01bd16eab1684f32c300df6504a5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites, likely to lure users into downloading further malicious content or visiting phishing pages. The presence of multiple distinct hosts and the use of formcraft plugin uploads suggest a coordinated effort to distribute malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfa4cbe094---55735448280.pdf In PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075457d0eded---71367627485.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/30625014296.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/6bf6f327fa7eeb611b4c661a3c072343/12190957531.pdfIn PDF document text
    • https://service-panev.com/userfiles/35071181181.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1a66b872a4---ravojoroxufulimedutonubo.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608f107fe4b0b---91956079493.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b519a294c7a---90913179380.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160836745de4d2---70716185012.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16082f56d04ffb---52387706341.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/422608ad4ae804f3618cfc7d9b0e7b99/bazoburizujusi.pdfIn PDF document text
    • https://avenue102.com/uploads/file/67673920817.pdfIn PDF document text
    • http://ototavandosemesi.com/resimler/file/xagexexatu.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/c4f11b557d1804e84f53cbb3c7f7ad35/galonavinuxigunubebiwaf.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/enn8iv6ec7d63i84l5mkb890j8/vuredax.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/9d25023b4a202ec93e1ec54c7f6b092e/rurilaviwopebonodel.pdfIn PDF document text
    • https://olterus.com/contents//files/61184555628.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e366e7c2d7---tirolukuz.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc65801ba8---dutolapofafekafuvujik.pdfIn PDF document text
    • http://ck-kutnahora.cz/gais/image/file/getozujurew.pdfIn PDF document text
    • http://beerskiboot.de/img/upload/file/71966428424.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/5c3973e115df399343538b6a790adf59/bunekogazonuvaramopomako.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/t70um3ggtneqoui15qpfpnsclt/31238183502.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c934c1a858---papefogagilaripagajikox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=nodules+on+palm+of+handPDF 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_off0000f313.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF313 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010b25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B25 17272 bytes
SHA-256: 75167735b2070ba65d8ef5bbb997e02913bfe7232beee3f971ce0e6b7451ede3
font_02_sfnt_off0001381b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1381B 10548 bytes
SHA-256: 3d1b6ffb173986a4f4521b58321c1f9d3b32970a26de5543e2edf40c80b3241c