Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae25e9f41d6f7863…

MALICIOUS

PDF

68.2 KB Created: 2021-10-02 19:18:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: d219335f6757a744a57511d40492972c SHA-1: 46ca629d758c0b3c0fd01bf32b6979c5c545261c SHA-256: ae25e9f41d6f78637755ded8a7122f1d20a0354b4a6e3dbe09e645ccb50de06a
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF is identified as a phishing lure due to its small size and image-only content, typical of a screenshot designed to trick users into clicking embedded links. Multiple heuristics indicate a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a distribution network for malicious content. ClamAV and ML classifiers confirm its malicious nature, likely as a downloader or redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://lanjutpt1.com/contents/files/65065585004.pdf In PDF document text
    • http://musorcentrum.around.hu/files/article/file/8143353840.pdfIn PDF document text
    • https://luatkhangthai.vn/upload/fck/file/mokagimulagoluvimo.pdfIn PDF document text
    • http://nsfeed.com/_UploadFile/Images/file/fukideparerosofag.pdfIn PDF document text
    • http://avanti.pl/userfiles/file/fixet.pdfIn PDF document text
    • http://www.parinet.fi/tiedostot/files/nekimifiwexiruwunu.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/13781336550.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/24420587446.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1615649056cab8---14143742914.pdfIn PDF document text
    • https://weekendtripskolkata.com/userfiles/file/45513511719.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/15175636715.pdfIn PDF document text
    • http://sevenseahotel.com/uploads/images/files/nagakusog.pdfIn PDF document text
    • https://dogodanang.vn/uploads/image/files/bewiruxalamel.pdfIn PDF document text
    • http://geoodwierty.pl/files/file/62213349189.pdfIn PDF document text
    • http://highdeal.linkeo.net/ckfinder/userfiles/files/73930679704.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/161316c4591ef3---karoxopuxutoxagakoneruji.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd27d60d55---zediforadofekivunalomafi.pdfIn PDF document text
    • https://censcakmu.org/board/file/files/18473320107.pdfIn PDF document text
    • http://stattus.com/assets/file/4493868987.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/44525882971.pdfIn PDF document text
    • http://laskod.hu/userfiles/file/50026715102.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c8a6895601---49839466797.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=audi+models+with+manual+transmissionPDF 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_off0000b00a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB00A 10680 bytes
SHA-256: 3ad8e2db38a2ef139595ee1741ce3ed69b97e6d6d4640d4e11a3b503e7607a1d
font_01_sfnt_off0000c866.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC866 13840 bytes
SHA-256: b2ddfc8acdf970bd0cc1eea3e9e90faadf567a5668f7ce32d4df20640c1ccaab
font_02_sfnt_off0000ead1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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