Malicious PDF — malware analysis report

Static analysis result for SHA-256 883168a951e8782f…

MALICIOUS

PDF

111.3 KB Created: 2021-08-07 18:00:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 085d6664a08a987035d7ac97b64dc090 SHA-1: e5ef9621fcbda8315d734aac5d385331d0660561 SHA-256: 883168a951e8782f1446b68e50b7413922aaef5bd9f1531bdc43ff17044f53b5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous URLs hosted on compromised WordPress sites and disposable domains. These links likely serve as lures for phishing attacks or to distribute further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://nomylo.ru/uplcv?utm_term=what+states+now+have+constitutional+carry PDF link annotation
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/cb45293a3e33cd0a5775f6987d45b43a/57415609376.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/9e7c8e3a715a37c2955b6d185a573916/82529963330.pdfIn PDF document text
    • http://movitecnic.fr/ressource/site-image/files/xuxakinufuwibeginizapuxew.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16071f39070775---laboji.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c63ed9f2a57---19036965021.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021070508434351.pdfIn PDF document text
    • http://magooferta.pl/uploads/fck/file/fopabijetir.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/33571e93458fee060123bf74a7515eb5/37822960347.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1606eee2f44561---vopadog.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e30d9cb7a04---wupuli.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607859fce10e9---pamukovetejelisofe.pdfIn PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/33406551036.pdfIn PDF document text
    • http://anandtouristcorporation.com/uploads/bepexibamamafujekexegala.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/t2cknsnjdfi9f077l0lk5lujgv/melosex.pdfIn PDF document text
    • http://imaginove.eu/data/Files/sademewajapinavetawofa.pdfIn PDF document text
    • http://www.dreamstoreonline.es/ckfinder/userfiles/files/gotuwumila.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a637f63411a---84602296611.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b50e650d98---26909215414.pdfIn PDF document text
    • http://fitviewer.biz/files/file/22679334272.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/fifigumato.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/4f73e5b909edf033f23202948c37065f/58933622148.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a73c44808e---62147769478.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/d1ed23c2f6b448120de0d174be409046/getubulox.pdfIn PDF document text
    • 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_off00014f88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F88 17892 bytes
SHA-256: e4c29a8cf71ffa96368df854798f6d7e5a8d304512fd353785815253ffbabe05
font_01_sfnt_off00017ec0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17EC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000196d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x196D7 10688 bytes
SHA-256: 3ef815f1bd29c61d75ae8f2bcf28eb2fe110a87c26388604ce669ef8adab0ffb

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