Malicious PDF — malware analysis report

Static analysis result for SHA-256 81895f4297014c5a…

MALICIOUS

PDF

84.3 KB Created: 2021-09-07 11:52:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9768334229a9943cfc41d1556c57381e SHA-1: b22d29cff2c9a0c568a886f6d786f99ef800935a SHA-256: 81895f4297014c5af0153b3678683ef31a688d0b084edeb8de57e719481c1664
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF document contains a link farm pointing to multiple distinct hosts, many of which are associated with compromised CMS uploads or disposable hosting. This pattern is indicative of a phishing or malware distribution campaign, where the goal is to redirect users to malicious content. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://roxburyhs1987.com/clients/63080/File/59180901499.pdf In PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/147f14e8f2a61c1d48c77467b50f9f70/22213039685.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/51819951123.pdfIn PDF document text
    • http://aplus.to/userfiles/file/vumile.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/2874384312.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acd9cb299f7---nezafez.pdfIn PDF document text
    • http://humanlitech.com/files/files/23025358162.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/ritubujibene.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a10be996ff---getejamujelu.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fce0c2d0370---mefinere.pdfIn PDF document text
    • https://tidaksusah.com/contents//files/16761907815.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b4de4d839---gupaw.pdfIn PDF document text
    • https://magerp.org/upload/files/45744934276.pdfIn PDF document text
    • http://tiszaladany.hu/upload/file/buwemolasek.pdfIn PDF document text
    • http://adice-area.com/pictures/files/tozirunovuvomofeji.pdfIn PDF document text
    • http://com123.vn/uploads/file/36374169247.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16103e65f60aea---wirabutebemurigebidekog.pdfIn PDF document text
    • https://vanphongphampmc.com/upload/files/suromed.pdfIn PDF document text
    • https://jotekonybakterium.hu/userfiles/files/joveretojojaweva.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/81331053586.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/15328619756.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/bue7e28q67rukefj211k3sn5t2/63481006587.pdfIn PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073724c01eca---mutaxipisozes.pdfIn PDF document text
    • http://ohmamakitchen.com/uploads/files/fuwoselefesixikopisimoxib.pdfIn PDF document text
    • https://istanbularicilikfestivali.com/upload/ckfinder/files/nosepivideweniwalixitaroz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=manufacturing+engineering+and+technology+8th+edition+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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e277.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE277 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA89 18580 bytes
SHA-256: 89e0ac3cd239eb8c09b7cc77c474dbf621c9ead39e899a14c6dede72ffc44fde
font_02_sfnt_off0001299a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1299A 11148 bytes
SHA-256: 1c0c539a3a30a84a890b7e1eca71e88bc96d90be150243fde8cc23f865e53dc6

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