Malicious PDF — malware analysis report

Static analysis result for SHA-256 434770f52561ecfd…

MALICIOUS

PDF

80.4 KB Created: 2021-07-17 06:55:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f961ccc7634e519133bfaef54fb2aeaf SHA-1: 6308b06cf5a5512003bcfea2a304b4b237a1723f SHA-256: 434770f52561ecfda84b2554787e93db68b2ea39d0e3c9eece31c31934689d96
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. Heuristics indicate it functions as a link farm, with many embedded URLs pointing to compromised CMS upload directories. This suggests the PDF is designed to lure users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://www.shropshirefurniture.co.uk/admin/ckfinder/userfiles/files/41254199158.pdf
    • https://monamifrance.com/FileData/ckfinder/files/20210707_1CFFE378C57FD929.pdf
    • http://kubabus.cz/novy-web/upload/file/bubadibedomefisazuvodaja.pdf
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/3db2763287f3e439ff934100184f825d/dixogoxefibek.pdf
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/71172052545.pdf
    • http://biurod9.pl/public/userfiles/file/89534786238.pdf
    • http://rasciindia.com/firetech/ckupload/files/laxufigadatutexup.pdf
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/160808d1dec3b9---wigokexuvap.pdf
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aae36b8b822---13754810244.pdf
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/74b1f23ac4b5c8627504bcaff4507a8a/kimozaxanazafaxexugikalod.pdf
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/eqgme01ctqtnhcp9g92gt6pskl/tuxowaparali.pdf
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f28442cb8a---7170928522.pdf
    • http://capri.lt/userfiles/files/pufowufesepob.pdf
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/wefasu.pdf
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0bc4fd90bf---tosevek.pdf
    • https://bbpartner.cz/userfiles/file/21828690731.pdf
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f407e803df---xuzoko.pdf
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607b599dc87d3---60839485864.pdf
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/823af3d1aeae753e8071842181aec884/laxewonali.pdf
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa1a8e329a---50932780098.pdf
    • https://eletmodguru.hu/files/files/33931162101.pdf
    • http://hanleyresources.com/images/lukuzuvoranuzanizezoj.pdf
    • http://afghansolar.com/userfiles/file/kapikeposibo.pdf
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/q7cd64ughrursl2lft2sguoiaa/pasolaboseneniwakaku.pdf
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b7be31e7112---57127285134.pdf
    • http://abwalabamaave.com/uploads/files/82440158509.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=how+to+find+where+vectors+intersect
    • 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_off0000d74d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD74D 16792 bytes
font_01_sfnt_off0000ef5f.bin
0870b7c0f46de2ebcb5fe0d561ffc182600d9557b2aae694a4743ebed6b523d5
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5F 16976 bytes
font_02_sfnt_off00011bf8.bin
9e8a5ac61f703b862a77c6b7cb3830ea3995f542536fb3565a309a481dc7f44b
pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF8 10508 bytes