Malicious PDF — malware analysis report

Static analysis result for SHA-256 13db3005d38f47fd…

MALICIOUS

PDF

80.1 KB Created: 2021-09-06 12:19:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a58ad4f97983513d428dcdc7d9734137 SHA-1: 473caf512448fce0a41384c3c3bb5a05ac1fcb29 SHA-256: 13db3005d38f47fd547f07982350b2656861806afeded5ec018b58e7c8a734c2
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16129c26dc7077---sumizoxudijoxufiwero.pdf In PDF document text
    • http://first-group.kr/ckupload/files/96102698189.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/marev.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/87066384320.pdfIn PDF document text
    • http://marasintl.com/public/ckfinderuploads/files/sanariteweruxolad.pdfIn PDF document text
    • http://zgic.ru/!upload/files/71469380868.pdfIn PDF document text
    • https://budgetparking.ca/admin/uploads/file/kafedubopof.pdfIn PDF document text
    • http://galettedesrois.hu/userfiles/file/xigebizezasenumitof.pdfIn PDF document text
    • http://szzxwx.com/Upload/Upload/file/20217241029444307.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/wozirazifuda.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/livarud.pdfIn PDF document text
    • http://ayurveda-shiatsu-nice.com/upload/files/2220806354.pdfIn PDF document text
    • http://abwingssuffolk2.com/uploads/files/30641499998.pdfIn PDF document text
    • https://chambredhotes-savoie.com/ckfinder/userfiles/files/67399395413.pdfIn PDF document text
    • http://ladyqueen.it/userfiles/files/popunukalugirazemapi.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607474d9a5996---kebuwivimo.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ffdb4f33a1---84010226536.pdfIn PDF document text
    • http://market-oborudovanie.ru/upload/file/18553510800.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16083fb3f17c53---5508411801.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/7e761f0e7edfadd204f15a8e7a8242ec/bovufixukamibalegak.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/6hoqou10fin32qi83d4ge6spm3/jukopagigib.pdfIn PDF document text
    • http://hncastlecable.com/d/files/24601517495.pdfIn PDF document text
    • http://sushiloverca.com/uploads/files/savagepamiluvanuxiv.pdfIn PDF document text
    • http://oiseau-bleu-morzine.com/userfiles/file/69840327334.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=dictionary+english+spanish+cambridge+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_off0000d460.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD460 11320 bytes
SHA-256: ae744969da3e7192378a87feebe7129f243acddc3845d16b3a33dd46dfb6696a
font_01_sfnt_off0000ee67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010679.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10679 17224 bytes
SHA-256: 878eacd28c622d3fbe08f127c20239fd396070f76bc0a86890d63bfe9ddbe8d7