Malicious PDF — malware analysis report

Static analysis result for SHA-256 a80c4dc6acfee21f…

MALICIOUS

PDF

74.6 KB Created: 2021-09-24 11:22:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1209fda6a4c0510b8ff07ec74c52cc9d SHA-1: 387e3f140e09f9634a09e4ef3fb61e901cde2239 SHA-256: a80c4dc6acfee21f911bb8e6fa6fcd852749dd908c2db8c0c021a292a576b0db
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised or disposable domains, suggesting a link farm or phishing lure. The PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://olsztyntransportmedyczny.pl/userfiles/file/tevufakasidamaxesumame.pdf In PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/16139537765374---xetigega.pdfIn PDF document text
    • https://torgradio.ru/new/files/file/91435664636.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614cf941796e9---71310675283.pdfIn PDF document text
    • http://sbkf.org/files/files/loralemuwudafunedamegiwo.pdfIn PDF document text
    • https://nguyenvanhuongloc.vn/app/webroot/files/images/pages/files/2285253155.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/4f9c3550fd928aee865d770089518ec4/28573424679.pdfIn PDF document text
    • http://dienvietbac.com/uploads/files/92117751906.pdfIn PDF document text
    • http://boilerservis.ru/uploads/files/75296055761.pdfIn PDF document text
    • http://anbuadidravidarmatrimony.com/ckfinder/userfiles/files/52141536672.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613a88208dd98---43007622387.pdfIn PDF document text
    • http://herve-coiffure.ci/files/75522193408.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147d3edc4e17---xisut.pdfIn PDF document text
    • http://aktasmatbaacilik.com/resimlerfiles/18483554054.pdfIn PDF document text
    • https://loyalangkorapartment.com/userfiles/file/31158470680.pdfIn PDF document text
    • http://perchegouet.com/ckfinder/userfiles/files/tonupepela.pdfIn PDF document text
    • https://togelunited4d.com/contents/files/56934566173.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16143a29b30628---46595316263.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/d67d28ce88199ae32139eaaa86a76b55/53762679067.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210923041829.pdfIn PDF document text
    • http://www.adarshvidhyasankul.org/userfilesfile/megudedexaxedanazasuveliz.pdfIn PDF document text
    • http://www.andreapondika.cz/file/68895712815.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/3c47a96bfb50e44f07eefa055e560fa3/lulufewisotadawati.pdfIn PDF document text
    • http://rungruangsteel.com/public/upload/userfiles/files/kuvulibugi.pdfIn PDF document text
    • http://zjqzzx.com/uploadfile/file/2021091416535573499.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=hero%27s+journey+joseph+campbell+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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c0d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0D6 16336 bytes
SHA-256: a87287c3845edd100e8dccaea70dcc8ae46fdff902b8f9b307fbeebf5d5788c3
font_01_sfnt_off0000eac5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC5 11204 bytes
SHA-256: a2259d2424b515b701c502761061beaaadc8a09fee2f800b47db2a2783747c57
font_02_sfnt_off000104a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1