Malicious PDF — malware analysis report

Static analysis result for SHA-256 303e032dcbcebd66…

MALICIOUS

PDF

77.5 KB Created: 2021-09-15 21:34:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3731ce5893dd3e65af13fcecfbd25e1e SHA-1: 8b6240180093e6f551bfdace9a7d200406b97645 SHA-256: 303e032dcbcebd660cebcccf5459b328f1276e5b09b8b37b504aff23a1fbb847
156 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to lure users to external sites, likely for phishing or further malware delivery.

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://wastran.ru/uplcv?utm_term=entender+la+arquitectura+leland+roth+pdf PDF link annotation
    • http://olsztyntransportmedyczny.pl/userfiles/file/kasozomuvinuxozepiwowaz.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613176080a362---kebinejixidolewanasa.pdfIn PDF document text
    • http://inventory-acepipe.com/images/uploads/files/lawagajomevodonumuvovuj.pdfIn PDF document text
    • http://dnt-mayak.ru/content/File/nefufuvazanosonubalesun.pdfIn PDF document text
    • https://vinaconexmec.vn/uploads/news_file/60113025758.pdfIn PDF document text
    • https://bepcongnghiepphuchung.vn/userfiles/file/mofofezosufo.pdfIn PDF document text
    • https://robert-zauer.cz/userfiles/file/vivopurinopadadovak.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16141de8678b64---74879240078.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613573cc002ed---bopowibeviralu.pdfIn PDF document text
    • http://tvkinter.com/file_media/file_image/file/60335783361.pdfIn PDF document text
    • http://fanghsin.com/uploads/files/202109030110451050.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/a57677abe2889f017bdefefce674c2ff/wepafenogokunibo.pdfIn PDF document text
    • https://cupanghitam.com/contents/files/11106971174.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/84901252795.pdfIn PDF document text
    • http://webinaris.blog/ckfinder/userfiles/publics/files/18412537233.pdfIn PDF document text
    • http://vector-luczak.pl/new/fck_user_files/file/22880593160.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6d6723214---23726868135.pdfIn PDF document text
    • http://www.salac.cz/ckfinder/userfiles/files/21362883260.pdfIn PDF document text
    • http://alfonsoguiggiarchitetto.it/userfiles/files/74516293305.pdfIn PDF document text
    • http://movitecnic.com/ressource/site-image/files/82267197810.pdfIn PDF document text
    • https://alharithiforcameras.com/ckfinder/userfiles/files/49268411631.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138d678bcad4---zilovudaxemik.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132aa434df9d---fepebax.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_off0000c92f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC92F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e146.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE146 10780 bytes
SHA-256: 1dea1e5002929ced23c2e1121ee228cae0b0a4d435a0b727e3b9bcb21d6531e2
font_02_sfnt_off0000f9b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B5 17736 bytes
SHA-256: 5a9716d4ff053e26cbbc560f95e1cec15e737c8e992a77347609cb3ab9fd4da8

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