Malicious PDF — malware analysis report

Static analysis result for SHA-256 771e8a3269165379…

MALICIOUS

PDF

97.4 KB Created: 2021-08-25 03:10:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 881f056a335ef6901bb9dcf1bf217c1e SHA-1: b9fd8f3f1ab507e746974cbe158cb85e470251e1 SHA-256: 771e8a32691653796ae608372fc50b3770e414673d4227a9b97c42fc6e302b78
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is unreadable, but the heuristic firings and numerous extracted URLs confirm the attack pattern.

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 http://vimar.ua/userfiles/files/rogarus.pdf In PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e6165321b3---9535358413.pdfIn PDF document text
    • https://chp-travel.ir/data/file/masomirubibozexivora.pdfIn PDF document text
    • http://matsusushionline.com/uploads/files/44394855496.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/5e8c78d0d9aea929a00359767d3fd71b/57521258629.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/54322617481.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/18555481575.pdfIn PDF document text
    • https://spiuruguay.com/ckfinder/userfiles/files/48971251074.pdfIn PDF document text
    • http://gojjang.com/uploads/files/kulipus.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/5k1hhadsgga6kqkgj3mih9cb26/rudabuvi.pdfIn PDF document text
    • http://soflocops.com/clients/67403/File/dizebonogofoxukarifaga.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/161000018941dd---mupenizolabetovodopez.pdfIn PDF document text
    • https://godparents4tz.org/home/god/public_html/ckfinder/userfiles/files/41397879320.pdfIn PDF document text
    • http://kondicionery-domodedovo.ru/upload_picture/file/54440683765.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/9a079e11b3c1eefa36f0923213cc7a95/janevikuletuxi.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b06ae438386---sonil.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b78b330a9d1---rixof.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/53qcktavp0hfn6907fhemmk22c/bokinofafalipixe.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609060fecb61e---ketez.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160925b5121a22---87790340452.pdfIn PDF document text
    • https://coastalholidayproperty.com/ckfinder/userfiles/files/43603377010.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a718bcb13361f8bf89fb51c56ceb6553/96118123340.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/5c28e8366743ff01f3db8dfe971032be/56386443047.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=3rd+party+indemnityPDF 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_off00011937.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11937 17732 bytes
SHA-256: 97d85fe6af4d5d9ad15f82aa7a7d72c395ed135ba12abc71c96e52cb07926c4c
font_01_sfnt_off0001479c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1479C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015fb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FB3 10408 bytes
SHA-256: b34a5fc7f1b6f58f04971f18db8b2c6eb55a904ef211d41e015ff91b20779045