Malicious PDF — malware analysis report

Static analysis result for SHA-256 86a976103eb322ed…

MALICIOUS

PDF

80.0 KB Created: 2021-09-09 07:22:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: be0c251ec003c1cc2a1800496b9c02a6 SHA-1: d5da9591ded202b6da81ba72102813ecf596abc8 SHA-256: 86a976103eb322ed68649b4435e1681041000389b581c79016a8aeeac04d071b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. While no scripts were directly extracted, the PDF structure and embedded links suggest it's designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://seikai.jp/free_images/files/73962725919.pdf In PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/vizowuti.pdfIn PDF document text
    • https://sassanoproperties.com/FCKeditor/file/53031689730.pdfIn PDF document text
    • http://roland-toys.eu/userfiles/file/vegif.pdfIn PDF document text
    • https://tigaintan.com/contents/files/megilon.pdfIn PDF document text
    • http://planetamama.ru/files/file/65424859682.pdfIn PDF document text
    • http://villacappuccina.com/userfiles/files/wivaroge.pdfIn PDF document text
    • http://clear-es.net/yamituki-n/uploads/files/81554664103.pdfIn PDF document text
    • http://citra.cl/userfiles/file/22320125759.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16134d500a5bca---numugogof.pdfIn PDF document text
    • http://deleersnijder-bocaege.be/images/file/76686972246.pdfIn PDF document text
    • https://hsdinstruments.nl/uploads/files/gejuvanako.pdfIn PDF document text
    • https://traffictkt.com/viking1/uploads/files/rovamafojituvorojepagema.pdfIn PDF document text
    • http://handgun.ee/media/file/84555852500.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161350d2971823---32338602578.pdfIn PDF document text
    • https://autoradiator.mn/uploads/ckfinder/files/69092382167.pdfIn PDF document text
    • https://www.opsclown.it/ckfinder/userfiles/files/96216731293.pdfIn PDF document text
    • http://xn--b1afklwjc5g.xn--p1ai/ckfinder/userfiles/files/juwidenadowuzowesu.pdfIn PDF document text
    • http://gmicropilotes.com/uploads/files/65180525758.pdfIn PDF document text
    • http://taxplus.in/images/contentimages/files/47612106418.pdfIn PDF document text
    • https://408of53crownstreet.com/assets/media/files/womobemixaki.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/161386effa8244---84770323097.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135c81ccea54---lezitafi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=top+gun+watch+freePDF 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_off0000d469.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD469 17460 bytes
SHA-256: d91f7b63bdc0d5b759c56876ea3a8fdc30275196e7f0f8baad4be9a9f19a9c42
font_01_sfnt_off000101fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101FB 10604 bytes
SHA-256: 82dd94eeb9b071f27d2713cb42f44c7ff7c0029528e35aebf4501aee03768344
font_02_sfnt_off00011a4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1