Malicious PDF — malware analysis report

Static analysis result for SHA-256 147ac4693fd898aa…

MALICIOUS

PDF

83.0 KB Created: 2021-09-09 00:56:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 40254e7fc30ea39c3f9b538708b0ca6f SHA-1: 3fe7edc71038b646023a3bfbd3882e55339aad30 SHA-256: 147ac4693fd898aa7c69560a3a6df27d5f86782525b8868f1f2caa2a7883facf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to various PDF files, some hosted on compromised CMS uploads. The presence of multiple external URIs and a link farm structure suggests a phishing or malware distribution campaign. No scripts were extracted, but the overall structure points to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://lovesenergy.com/file/48015768416.pdf In PDF document text
    • https://bibliotheque.ville.deux-montagnes.qc.ca/ckfinder/userfiles/files/difulefefesireritu.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613394e4449ef---57362198718.pdfIn PDF document text
    • https://network-italia.com/file/94794022778.pdfIn PDF document text
    • http://xn--2o2b17g32e8xisqq.com/userData/board/file/85596019148.pdfIn PDF document text
    • https://arhstroi.by/uploads/files/98109972578.pdfIn PDF document text
    • http://aromamahabaleshwar.com/ckfinder/userfiles/files/tujowaju.pdfIn PDF document text
    • http://pokemom2.com/uploads/files/20925844828.pdfIn PDF document text
    • http://ibnuaffan.com/ckfinder/userfiles/files/98836516830.pdfIn PDF document text
    • http://dfwarbitrator.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/46662934294.pdfIn PDF document text
    • https://egokituz.org/files/galeria/files/17462411667.pdfIn PDF document text
    • http://rsti.biz/files/fck/file/katojujomutewakok.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137cc94ab4e4---45205141544.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/161302f6287998---20047421079.pdfIn PDF document text
    • https://fetogram.com/images/upload/files/sukafodubodesasategoli.pdfIn PDF document text
    • https://autoradiator.mn/uploads/ckfinder/files/mavunojenolagegife.pdfIn PDF document text
    • http://tsyrulnikov.ru/upload/file/xikiruramujuzivozineriwo.pdfIn PDF document text
    • http://abwwilson.com/uploads/files/poridenukebozobowejem.pdfIn PDF document text
    • http://studiogiovannone.com/userfiles/files/56547754079.pdfIn PDF document text
    • https://1000families.eu/userfiles/file/rosix.pdfIn PDF document text
    • https://digireg.ch/upload/lufiwefuxeketuwu.pdfIn PDF document text
    • https://bodykneadstherapy.com.au/ckfinder/userfiles/files/36662960620.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/549c375bf539d1822dc0a056de6bf384/kukiwurin.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136c0a33c0ec---45652851221.pdfIn PDF document text
    • https://topclassgardening.nl/images/file/92707149757.pdfIn PDF document text
    • https://ekoelprom.pl/public/images/editor/file/gijedabegebilinonoxaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=cinderella+story+movies+full+movie+englishPDF 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_off0000dba8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA8 18996 bytes
SHA-256: 22a6dcc8977a2453829151c5e7863051f7e741e8b5357d9e0522a91011a0f60a
font_01_sfnt_off00010c6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C6C 11112 bytes
SHA-256: b2285a9115554c59515cefa17249aa31473997abb2c017fc8f9e1b5bfe2a76e5
font_02_sfnt_off00012607.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12607 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1