Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c36f08b2dce9600…

MALICIOUS

PDF

82.0 KB Created: 2021-05-29 17:05:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: edac18f0397effa2e73a98ab6a762e88 SHA-1: 2d7ea1e2fe8c3a2763b446fc6b8818eba817d934 SHA-256: 1c36f08b2dce96008e32ae9ff9ad3534b70fb1af5b1e96db82698515cd28278e
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. It functions as a link farm, directing users to download files from compromised WordPress sites under the guise of providing iPhone ringtones. The presence of external URIs and link farm heuristics strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://catamma.ru/uplcv?utm_term=iphone+high+sound+ringtones+free+download PDF link annotation
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/c7d05e5bd9584258eebfe0b18f73b4fe/27885008179.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607bdfea3e710---najejudenufudasizixudoga.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/f8e838274bb2ff61876e9dd38b169d06/kuman.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160aac8ea898ae---87379526738.pdfIn PDF document text
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/22082227b275db9e0713e57deace6ae0/vesawezezigevesaxuvu.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/7152ec83f79112fd6ec519336cf75854/65278934008.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/6ba90eb59e3653c4416e12e408f40ccf/bumamatifanopipipotad.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/eaa65034996e17c9d9c58f4a214577d9/pajavaneg.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/jr187rlc364r0f44rnforuljn7/98384304891.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160858c1deae28---92812940576.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c936ee745a---muwonogidugaputopimafugi.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3006d60ee5---punifef.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16079f430031b9---17292365445.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/u3iv2464gketc4kntqlg6h6vau/rudogogasujano.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/89695139202.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce87de6a75---61342102116.pdfIn PDF document text
    • http://mywayrtk.info/userfiles/file/sevuxenalemowaw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B1 5212 bytes
SHA-256: da54cb9b84c48ac352854e4de6fab9271b809fd44727e4b7a8eacf7f638a58d0
font_01_sfnt_off0000f274.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF274 10416 bytes
SHA-256: 26162993c4938db7e7a7ffb7ac8ce83171efe51b12ca7b0ac44c2b0733e98cd3
font_02_sfnt_off00011625.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11625 16388 bytes
SHA-256: 534e44c921e8acb9c8e993207df297c85ca6c672af4c6174c05b3ca24a170572
font_03_sfnt_off00012bb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BB0 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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