Malicious PDF — malware analysis report

Static analysis result for SHA-256 72c8897fa46c4788…

MALICIOUS

PDF

72.9 KB Created: 2021-09-25 00:46:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8f7b01cba2f7581137ec18451979c478 SHA-1: db3652ab39eeb99b0ed8c61b83406a7888868a47 SHA-256: 72c8897fa46c4788fda99e1c01682b0af53a83953db8af2f15f61afecb868092
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://catamma.ru/uplcv?utm_term=soldier+emoji+android PDF link annotation
    • http://sarkar.ie/userfiles/file/20908762208.pdfIn PDF document text
    • http://sabancilojistik.com/userfiles/file/vatepolixuke.pdfIn PDF document text
    • https://035620126.tw/upload/greenkitchen/files/tuxawijuwirasevuxotolix.pdfIn PDF document text
    • http://kengosushionlineorder.com/uploads/files/21705868259.pdfIn PDF document text
    • https://llbyggodesign.se/UserFiles/files/vijuvamomemoji.pdfIn PDF document text
    • https://sweetburden.com/upload/users/files/puzejisomasolugolav.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/894d8f7e070f17be2818af101779f42b/69021481165.pdfIn PDF document text
    • https://thefencedocumentary.com/adminfiles/file/muwinusemep.pdfIn PDF document text
    • https://cnn-logistics.com/asset/files/torotazixuxoponuvepa.pdfIn PDF document text
    • http://schubert-hh.de/image/file/defabakiporinuni.pdfIn PDF document text
    • http://xn--h1aaebajlcgx.xn--p1ai/sadm_files/kimezugimu.pdfIn PDF document text
    • https://dursunguney.com/userfiles/files/xolowedasipivumudidet.pdfIn PDF document text
    • http://studiocalcinoni.com/userfiles/files/retiz.pdfIn PDF document text
    • http://visusmarble.com/images_upload/files/tijiwu.pdfIn PDF document text
    • http://chinalabware.es/d/files/zivijeg.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba74c860e4---91237827451.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5a68551b7---31973051453.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/161331846b3784---maxutotufave.pdfIn PDF document text
    • https://www.aillant-sur-tholon.com/ckfinder/userfiles/files/85244044316.pdfIn PDF document text
    • https://indirimlipin.com/calisma2/files/uploads/72530754375.pdfIn PDF document text
    • http://montex.pro/uploads/userfiles/file/donizusedajenapifuze.pdfIn PDF document text
    • https://hopadive.cz/ckfinder/userfiles/files/xamikalikumotilamona.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_off0000b43c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB43C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC53 10348 bytes
SHA-256: 8055cec5c462d41b6dbf6793e7b7767a203dc74a7cff79cec9d67818574d4216
font_02_sfnt_off0000e382.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE382 18968 bytes
SHA-256: 44b4b9cccba38d41035b5bb89b9210e797ca89fb4be3777427542d6c4782a24d