Malicious PDF — malware analysis report

Static analysis result for SHA-256 639bcf60ac77b8a8…

MALICIOUS

PDF

94.3 KB Created: 2021-07-19 17:24:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7c32a9998a2929e2d43767a400738f2f SHA-1: 530445d69a195340583936718d96e28ad687465c SHA-256: 639bcf60ac77b8a8be8212dfea47c262512b776a2e410998921fff72b2b8e963
164 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It functions as a link farm, containing numerous URLs that point to other PDF files hosted on compromised websites. The presence of urgency language suggests a phishing attempt, aiming to trick users into clicking these links. The primary goal appears to be redirecting users to malicious content or further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://ratsimae.ee/media/contents/file/88651934286.pdf In PDF document text
    • http://hurtmar.pl/Upload/file/welomiseboni.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b7840a8b581---fatisiraxawir.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16083b8cf101be---64624320053.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/seek0pbs41hake0cp0qeokafrj/5914025020.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/a314c0777f1b9d18ab8a5d75caf29aea/71306150292.pdfIn PDF document text
    • https://proxus.nl/file/wuxalisezexesi.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/5a2a8b51118404b64fc59d5821baafe5/bonip.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160def68a1359a---zidete.pdfIn PDF document text
    • http://sujitonweb.com/userfiles/files/dexolokeretulapijuri.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/73f959f5d443711a15e46fe6657ce18c/51533710643.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/m0tb2ov88im4mb38lkofb7g5s5/popalok.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098b9f40faaf---bisonigoluvunawevozi.pdfIn PDF document text
    • https://vntdc.com/upload/fck/file/ditiw.pdfIn PDF document text
    • https://brickzoo.it/file/zamomumemo.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094a5b142a4b---xewimosos.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/4n8t8p6oht9igli530tp4j6rka/12270588651.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/pejafupitibilil.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160945cfb9abe3---semijad.pdfIn PDF document text
    • http://azizolace.cz/images/file/85900337600.pdfIn PDF document text
    • https://5uempat.com/contents//files/mitusudupomegitik.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/ratovuxisonu.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608776f83c0ab---48236209577.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/8bad611a3c6693792d7d47412f90e2f3/11844638947.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=top+10+batsman+of+all+timePDF 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_off00010dc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000125de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125DE 10696 bytes
SHA-256: 8cec70f31ac86419b08c8d5ced862de8c36df5dd7af76e150d450cc4e69d67ab
font_02_sfnt_off00013e30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E30 17024 bytes
SHA-256: c89409fecc9d3ef7ddcb4a8ba396d5cdf29366b91ce444a91463e72c4600f2d8

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