Malicious PDF — malware analysis report

Static analysis result for SHA-256 4718f35dccd5267e…

MALICIOUS

PDF

78.2 KB Created: 2021-09-07 11:26:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 3e646acd46d6ae12cca560b1b89ecdac SHA-1: 9b3a67d283c317eae5a631cdb142ae7f5b83aa99 SHA-256: 4718f35dccd5267e9d0c319d63daa1e248612b3b23f78187267a5d0f49936ca1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 external URLs, some hosted on compromised CMS uploads. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially harmful sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bf7fca7fe7b---zobegiwevave.pdf In PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/15cee27c9a006b71a8a681abfcdb2ce4/93780267983.pdfIn PDF document text
    • http://deleersnijder-bocaege.be/images/file/6405301041.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/3b26864d1641bbac29cf8619c3eac330/vukozifopizexevadi.pdfIn PDF document text
    • https://aymsoft.us/aym_image/files/ropurinupemoluwofuf.pdfIn PDF document text
    • https://www.utn.ac.cr//sites/default/files/files/firanujunarotepufar.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/1fb9caa2a0d8dee68a558323a85c915f/bobaxugumubumakezolaxopol.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/78757542638.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/padekatiga.pdfIn PDF document text
    • http://srividyaastrology.com/userfiles/file/rinimebatobofiliwipavi.pdfIn PDF document text
    • http://lindendirect.com/ckfinder/userfiles/files/navuwovupawezuwexewafa.pdfIn PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/modimuselamezimop.pdfIn PDF document text
    • https://valenciamaids.com/userfiles/files/letawaromak.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d499e81f009---minutifomobanid.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/20ae72f5d2bd07a350a1529e5390fd40/pewodukiv.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc752b2801f---sugopudede.pdfIn PDF document text
    • http://kfbi.ru/content/file/xujegepivarelaraxidetufej.pdfIn PDF document text
    • http://www.lugashotel.com/data/editorfile/musotuguluxir.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/88166307329.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b00565c7344---lugaral.pdfIn PDF document text
    • https://chemasan.lu/userfiles/files/wowutifosamanumon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=pericardial+effusion+%E0%B8%84%E0%B8%B7%E0%B8%AD+pdfPDF 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_off0000c213.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC213 20884 bytes
SHA-256: 177879253b412c79cd952283eaba0b0f80eb5b68b1540422161596f98189e2aa
font_01_sfnt_off0000f8a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000110b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110B9 10792 bytes
SHA-256: 4b02a6fefc64fb33f82b0fdb03bed4100e6043ca7e1c6d60b0a110ba70138884

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