Malicious PDF — malware analysis report

Static analysis result for SHA-256 135d91507ff57c4c…

MALICIOUS

PDF

72.4 KB Created: 2021-06-30 22:12:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 3429a15bda6c956e094b9686576f9713 SHA-1: 774e5e6fe059b5ff0914d5e202197dbc9bd9cc54 SHA-256: 135d91507ff57c4c0cd40262343c01c385da59a712219563611db57bb7dbf4fa
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to numerous external URLs, many hosted on compromised WordPress sites or disposable domains. The document body is heavily obfuscated, preventing analysis of its specific content, but the overall structure and URL destinations strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://smidgel.ru/uplcv?utm_term=clay+county+building+department+phone+number PDF link annotation
    • http://drive4smilesontario.com/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/sufatumedetefapatiser.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/16075d03d9b713---zenijawebugab.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/7f8a34b79f47d154b396e98e5f8387df/feramikagi.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a57f9a4f598---62653460670.pdfIn PDF document text
    • https://areicon.com/images/file/fakalevezuzerub.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/userfiles/file/fovunofozatoxelexiwupawa.pdfIn PDF document text
    • http://studiotecnicobonoli.com/userfiles/files/58630406710.pdfIn PDF document text
    • http://baovevietnam-vnss.com/upload/file/48536058192.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f669aa201---94677983468.pdfIn PDF document text
    • http://rld-carbon.ru/file/64999678166.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/eedc66f616f7eba8f3b459edddd80bdd/lanugogizipavemimemaloka.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f071192fe0---71854108496.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/wisex.pdfIn PDF document text
    • http://umrllc.com/userfiles/files/3030951614.pdfIn PDF document text
    • http://walkandwagforveterans.com/clients/9/96/96cc06f6b2a5429c1325f0b535cddba6/File/71662059756.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/s635ujr4hmq72m53uqmlj5v1lo/ladojabaluzojojeselener.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bc4dd964e0---51846313673.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608ec48e02db0---20953778740.pdfIn PDF document text
    • http://ck-tct.ru/userfiles/file/3062499324.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/d6qgjabfaa2edpfmjhd93q3b6q/596043471.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609bab621ce48---fefazusukenulajudanub.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/255500c1dc1a064bdedc617d5620ed5a/podobadunaraj.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/gar3mq6ug010e3mq3af8vtgfk4/kekasifazuruxujesa.pdfIn PDF document text
    • http://www.sphotobooth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072c4b39d55e---biwezojipi.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_off0000bac2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAC2 11180 bytes
SHA-256: 850cbc3eee11ae11e1ce747fd25084be2e4d6460abd4f1294e0c0eafcea761d6
font_01_sfnt_off0000d450.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD450 15476 bytes
SHA-256: 76008f28678bdd26ec729d0f70079c97fffec32d329c7e1dd30d467c86bf4b4b
font_02_sfnt_off0000fbaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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