Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bdc029af28cc9da…

MALICIOUS

PDF

71.2 KB Created: 2021-07-13 10:14:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 8f7662adf5e4e5d357e7f238ab05764f SHA-1: 1ff47ad568028812f5c47b2b07e72884caa368e0 SHA-256: 4bdc029af28cc9da12a1341a3a19e3c84edf44e522cae27ca811179a66229137
156 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous URLs pointing to websites hosted on compromised CMS platforms, specifically WordPress. These links are likely intended to lure users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/0069e6819bc99d14e49a0ae0f7a95e4d/dagixisafezagewo.pdf In PDF document text
    • http://519pf.com/userfiles/files/ponugufilisuzugapipi.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160726a3a87418---likudofaj.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607b16c0c1490---90438457595.pdfIn PDF document text
    • http://whatdwellswithin.com/file/16283866583.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/bd93dcc6278ec8f1a198c97c75a5435d/livukogimesoda.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/sibanatatijunafe.pdfIn PDF document text
    • http://piqiso.ru/userfiles/file/kulixuri.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/woripiwab.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/35706843249.pdfIn PDF document text
    • http://ledspectrumthai.com/ckfinder/userfiles/files/rulegevunasuxabajef.pdfIn PDF document text
    • https://zweefvlieg.net/userfiles/file/85779735.pdfIn PDF document text
    • http://bsbcarpet.com/userfiles/file/28006461225.pdfIn PDF document text
    • http://bobmeetin.com/media/galleries/files/nobexawosulepodati.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/4022768263.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a98e21f29c5---26251198365.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/q3n858c25ggj90cgm4eo120hd6/27835329636.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160743849caa5e---10986075514.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/c3dfbo3un2qput9omvdod22fiq/96755417150.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/ed0eed68b8c3b04ad2d210b2e5d16767/19146605499.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=hot+wings+nutrition+factsPDF 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_off0000b476.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB476 10508 bytes
SHA-256: 46894b408bf8bb9dc7f718538f2eed7e443ec6f2bda8f146f6323c36f575cf62
font_01_sfnt_off0000cc97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC97 16744 bytes
SHA-256: 99481ba52bca472532beb7ea8b2c2acb7fb83ce935f35f4e66cb83042f722018
font_02_sfnt_off0000f7c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1