Malicious PDF — malware analysis report

Static analysis result for SHA-256 087051d505bb1d2c…

MALICIOUS

PDF

90.4 KB Created: 2021-07-31 06:36:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ce34ac51b3abccbaa002d8e05d17b896 SHA-1: e7ee76f11ebdd46103faf2658fe7f76f36afeac3 SHA-256: 087051d505bb1d2c94a2b6000ea131fe703bf8d4223e74fa3aa65711a4328c5a
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS uploads or disposable domains. The embedded URLs suggest an attempt to manipulate search engine results or redirect users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://itracmediav5.com/ckfinder/userfiles/files/rumakuwe.pdf
    • http://icltindia.in/userfiles/file/zemotesiviwe.pdf
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160b639f008713---15503083245.pdf
    • https://chetanaus.org/bheru/uploadfiles/file/soxavitapolakakavis.pdf
    • http://graviroz.hu/ckfinder/userfiles/files/14730156183.pdf
    • https://binhvi.com/upload/files/11837523788.pdf
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3cd78ef475---muwakigap.pdf
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/78483239486.pdf
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/zetaxemiselaxogofote.pdf
    • https://schlosshotel-murten.ch/userfiles/files/puzekudesexilup.pdf
    • http://vpecargo.com/userfiles/file/fekimamozebodefuleses.pdf
    • http://lokalizacja-gps.pl/userfiles/file/74907501146.pdf
    • http://mariopresto.pl/userfiles/file/11237425890.pdf
    • http://ipost.mn/ckfinder/userfiles/files/senakixoroxox.pdf
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0ca2f108a---48895608864.pdf
    • http://www.ujepites.hu/userfiles/files/56260092615.pdf
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160be3734c7ccd---40049502583.pdf
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f82b933d6---bemevadeb.pdf
    • http://uleshuzatshop.hu/files/file/56775737606.pdf
    • http://ajk-opakowania.eu/upload/fck/file/neletofejoxutavabalufuza.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=harry+potter+and+the+prisoner+of+azkaban+pc+game+secrets
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa8b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA8B 16792 bytes
font_01_sfnt_off000112a2.bin
cfa5666fd40e704cd3327bc5d8c8b3b3ba8f39e7e34d2548276de5cbca5c3b6b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x112A2 11420 bytes
font_02_sfnt_off00012cfd.bin
f35eea52107d735a21bf29f93836b4aed284b3e8677bedc51cc4a20ce194c999		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12CFD 17940 bytes

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