Malicious PDF — malware analysis report

Static analysis result for SHA-256 abddf90077c109ac…

MALICIOUS

PDF

90.5 KB Created: 2021-09-17 23:02:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d4ff598ace255573b79c204aeeea0ded SHA-1: bfb84da98173953daa93fa0a078367825b7ccdad SHA-256: abddf90077c109acbabb25489c91c337dc1100dce68a7eca78ddd9071971fc83
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to disposable hosting or compromised CMS upload storage, indicating a link farm designed to distribute malicious content. ClamAV and an ML classifier both flagged this file as malicious, specifically identifying it as a phishing trojan. The presence of multiple external URIs and link farm heuristics strongly suggests an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://coopinproject.eu/ckfinder/userfiles/files/gomovozatupigonemune.pdf In PDF document text
    • http://wpchkg.com/upload/image/file/mofebadapedibozinufi.pdfIn PDF document text
    • https://www.hkha.org/ckfinder/userfiles/files/84479418470.pdfIn PDF document text
    • http://eyela.kr/uploadfile/fckeditor/file/madanageramejowopolif.pdfIn PDF document text
    • http://polskienarty.pl/data/aktualnosci_imgs/file/78870113345.pdfIn PDF document text
    • https://kingdom.vn/userfiles/file/julubatevelu.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1ab1f3ff6---luxazurorovazafotiribu.pdfIn PDF document text
    • http://a2kat.ru/userfiles/file/46453645312.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1612fdbee0858d---56297373945.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137454130e74---53372251205.pdfIn PDF document text
    • https://socardan.com/userfiles/files/wedimaxurajolesobedibav.pdfIn PDF document text
    • https://barcelonamedicalcenter.com/files/galeria/files/bupobufigugegovunawapoz.pdfIn PDF document text
    • http://chenruichem.com/upload/files/debabakunenajoner.pdfIn PDF document text
    • http://sobateracota.ro/mm/file/sanuvow.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/a3b3681c08e93089bcdc0dbee01e0aec/95064985342.pdfIn PDF document text
    • http://studiovalecchi.it/userfiles/files/muzevupo.pdfIn PDF document text
    • https://seikai.jp/free_images/files/43398270218.pdfIn PDF document text
    • http://medrea.ru/upload/files/49689043579.pdfIn PDF document text
    • http://belgium-ex.com/images/blog/file/fimobomuleduzasunafusegi.pdfIn PDF document text
    • http://benrassam.com/uploads/files/texopuwegulasapuxu.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/2021951050345877.pdfIn PDF document text
    • http://cybernet.asia/UserFiles/File/73026638930.pdfIn PDF document text
    • http://splogservice.ru/content/file/ririvozetarivifubazozu.pdfIn PDF document text
    • https://hatinhjobs.com/upload/files/42769580935.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=cara+menggunakan+blogger+di+androidPDF 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_off0000ff98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000117af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117AF 10688 bytes
SHA-256: a84eda1988005cb6e3b5113de13bd55a6acffa94745b802d62969864e703f2d2
font_02_sfnt_off00012fdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FDB 16512 bytes
SHA-256: 8b11812f3e2036427f73237f77838ba9f6b9d77a5c7ee9e0f799612c49440028

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