Malicious PDF — malware analysis report

Static analysis result for SHA-256 34d0c1da6cbcbb8e…

MALICIOUS

PDF

82.2 KB Created: 2021-09-20 19:46:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0e582b1263d34f7effc3b8396c112648 SHA-1: 4ef1b6d1bc9e9ca8da382697ee2f37ff0268ffa9 SHA-256: 34d0c1da6cbcbb8e1072217d0a44f104b2727fd4311b65d80eddca19e7a65435
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The presence of external URIs and link farm heuristics suggests an attempt to lure users to potentially malicious sites for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://smidgel.ru/uplcv?utm_term=watch+saiki+k+online+free PDF link annotation
    • https://tourgardan.com/basefile/tourgardancom/files/nijavimosibepemivoko.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/56770537862.pdfIn PDF document text
    • https://gitteszoneklinik.dk/ckfinder/userfiles/files/rurufukodi.pdfIn PDF document text
    • https://dintek.eu/uploads/file/50310417969.pdfIn PDF document text
    • https://kamarkosong.com/contents/files/14395716581.pdfIn PDF document text
    • http://sntaviator.ru/ckfinder/userfiles/files/50082757821.pdfIn PDF document text
    • http://cybernet-ap.com/UserFiles/File/fotapevuzeku.pdfIn PDF document text
    • http://tfforming.ru/d/files/79060165323.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/lijusifitinatusojaweg.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/11962406901.pdfIn PDF document text
    • http://xn--9i1b14lzokxjcrti5um.com/upload/fckeditor/file/kumes.pdfIn PDF document text
    • http://noospc.ru/SITE/files/editor/file/96995543331.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/76aa49ae642624e8815a13fb8ada654f/79571982110.pdfIn PDF document text
    • http://propack-th.com/image/upload/File/50609200108.pdfIn PDF document text
    • https://ijaetis.org/ckfinder/userfiles/files/15994343409.pdfIn PDF document text
    • https://majubesar.org/contents/files/9209275091.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/45774bec7c833f82903cdb6fd6cc9a94/47030707039.pdfIn PDF document text
    • http://schuetzenfest-hemeringen.de/ablage/userfiles/files/77036163713.pdfIn PDF document text
    • http://solarhomepage.ch/fckeditor/editor/images/file/sodorilodamajexet.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/4160884ba0509759a77806d0a03577c1/xifegajoduletajeri.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_off0000dd03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD03 18348 bytes
SHA-256: bd27ba8b9483f3db9f591c7019fb08dc36a4d5df205a6dbfe48876e77dcb713b
font_01_sfnt_off00010c3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012454.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12454 10520 bytes
SHA-256: 34391e31d559e0430c17e0f855ac81afd7d2809fd5e6ee093aa8255cf75f3c9f