Malicious PDF — malware analysis report

Static analysis result for SHA-256 865f5362fa333356…

MALICIOUS

PDF

75.5 KB Created: 2021-09-03 14:58:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 89e643faec45cbc3c0fff03d8435af71 SHA-1: f5d87c7342c94ea425acbf73903c518542555f57 SHA-256: 865f5362fa33335683ad8265e24dec3c4c3fa5e54774da238f421eee41deb662
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the PDF structure itself are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://crewmak.ru/uplcv?utm_term=superlative+adjectives+elementary+exercises+pdf PDF link annotation
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/c4076bb2e74b82d41dd3f030f1ac8ac1/92615081947.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1610cd320389c2---53288931671.pdfIn PDF document text
    • http://gospel-pour-100-voix.com/fichiers/newsletter/file/93836588938.pdfIn PDF document text
    • http://vector-mebel.ru/uploads/files/22958249899.pdfIn PDF document text
    • http://canphantich.net/Images_upload/files/59189091526.pdfIn PDF document text
    • http://laweasy.kr/userfiles/file/povoravodig.pdfIn PDF document text
    • http://icloudcleaners.com/uploads/account/autoresponderfiles/399495559.pdfIn PDF document text
    • http://cpk.by/ckfinder/userfiles/files/23268538486.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d318c39509b---rufimik.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/us1c27kvaacthibbbc14dlc092/jugikudenawotati.pdfIn PDF document text
    • http://ehoron21.mn/uploads/files/pedaziwexajudesone.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/95d327863031b0c8cb1a8f9ff3215f95/28636184013.pdfIn PDF document text
    • http://dijladentalcenter-qa.com/userfiles/file/98783549664.pdfIn PDF document text
    • http://www.niziointerior.pl/upload/file/fipisezabidipevakavor.pdfIn PDF document text
    • https://sca-eagleegg5k.com/ckfinder/triplebuserfiles/file/xumus.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074752dcb1e5---78350949377.pdfIn PDF document text
    • http://happysmilecard.com/uploads/files/70781413867.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607ebed94011c---ziwojube.pdfIn PDF document text
    • https://ambient-interier.cz/files/files/rakejafotored.pdfIn PDF document text
    • http://movesearchesuk.com/userfiles/file/30233867896.pdfIn PDF document text
    • http://thepokewave.com/uploads/files/53881185520.pdfIn PDF document text
    • https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/gogof.pdfIn PDF document text
    • http://sicompk.com/survey/userfiles/files/51434590349.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_off0000c04e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC04E 17288 bytes
SHA-256: 9f6f2c97c57def859f0614532d81b3e18502da1a6d68998ea468044fe93f858b
font_01_sfnt_off0000ed84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED84 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001059b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1059B 11248 bytes
SHA-256: fcf92cb1e649b47430e7a9f5dd6dcfe649fe1885c148dfdb015deacc0a15b3e7

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