Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c3f8d7e772c91be…

MALICIOUS

PDF

89.5 KB Created: 2021-07-13 16:57:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 9fdd298d729e5d027eaba4dfd3a265f0 SHA-1: a5b4cef7f4188fd35eef1c624090c631c184dbf8 SHA-256: 4c3f8d7e772c91bed6b2835ce447b16431a7600f91679406cf703351cdf546c9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised websites, likely to facilitate the download of a second-stage payload. The presence of numerous unknown URLs associated with compromised CMS uploads further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/2ca9469518450bcb80be1bd5e4e5951b/xuzowajanasafotik.pdf In PDF document text
    • https://ctapigroup3.com/contents//files/poxepirisugamegiroviz.pdfIn PDF document text
    • https://synersys.fr/contenu/file/37069416314.pdfIn PDF document text
    • http://anoh.net/pds/userfiles/files/poluroxej.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/vs9j6k49t779c3c2k7vm5a0taj/54498194235.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/40e23288782d0128aa6e9cfc9f6a2684/jutixamimugawanosurajiv.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/mevobipopu.pdfIn PDF document text
    • https://actor-conseil.com/files/file/33799266522.pdfIn PDF document text
    • http://soles2walk.cz/data/file/nakokob.pdfIn PDF document text
    • https://bczenekar.hu/files/file/mivapujutojawejafuvof.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160e488293d5cf---5899689427.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/1ce0db3fa3b926ca023411da40eeb1f7/33171637287.pdfIn PDF document text
    • http://denki-shonan.com/uploadsfile/wotalojorilatagatopugefuz.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/e2dirfgjb6fiji25ob63feid2n/welapabekuvuzowota.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/16070480aa62ee---mafarafiliruxinujizot.pdfIn PDF document text
    • http://hollywoodterrace.org/clients/863344/File/femila.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/zirenetodebaviluwomer.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/rm5glv5gj43ql0rc77iqnspdt4/bedidujivezarejova.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/26701664c5191e049ff262296236efb1/jokukek.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/smqhjfbt2ujuchadofbn0j2odn/73634842039.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c36cd0ac829---rewepomenemijuloxerak.pdfIn PDF document text
    • https://ladangmimpi.com/contents//files/24780749020.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607746af342cd---zitini.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/6a6f6e58d162673c4ac02013243344f2/16781070942.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=crop+production+question+answerPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011358.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11358 10824 bytes
SHA-256: 9fc22f974156fc2b6a7fbe21da2aee8ee78da08471f4799ea186067022e789ed
font_02_sfnt_off00012c49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C49 16420 bytes
SHA-256: 024fd5c878021d280d5bc3416e2cb7bc81d17aeb7bc4d6eeabe8dd09ff268fd1

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