Malicious PDF — malware analysis report

Static analysis result for SHA-256 1de56a29be4b4be8…

MALICIOUS

PDF

70.6 KB Created: 2021-09-08 10:50:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1982e7ac68a4a8df6d5272bb0b82b1af SHA-1: 4b6d0009e4b393280c678daf33cf536f803d1949 SHA-256: 1de56a29be4b4be8e444febd2e637d15dca6f0c97c399da0954d4604e4e1b528
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute phishing content or malware. The presence of external URI links and link farms on disposable hosting further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://crewmak.ru/uplcv?utm_term=how+to+convert+enc+format+to+pdf PDF link annotation
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9b4650b39---69755109488.pdfIn PDF document text
    • https://harryfok.com/ckfinder/userfiles/files/batiwimiperafizabu.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160aeacb97e933---fisuvixaxojanipexosixarip.pdfIn PDF document text
    • http://drironcat.com/images/file/xarudonagugesamapujapap.pdfIn PDF document text
    • https://shevtsov-art.com/uploads/files/16975493140.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609472a178cc4---ravobisitol.pdfIn PDF document text
    • http://charugarware.com/DEVELOPMENT/charu_garware/uploaded/userfiles/file/63569848715.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1609424085a138---titar.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/buvadorasomaxugabide.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/o21mne9ncmnr0ectrt6rcnpbg5/55576791751.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/sajoludodap.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/4ai0qtk309e68m10bgkmhpc539/64457567470.pdfIn PDF document text
    • http://joeun-it.com/userData/board/file/vunoxifoluji.pdfIn PDF document text
    • https://okinawa4d.com/contents//files/47557633017.pdfIn PDF document text
    • http://garmagostaran.com/Upload/file/37487743300.pdfIn PDF document text
    • https://jancsoalapitvany.hu/ckfinder/userfiles/files/pivunokejek.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc68d0c219---56121140259.pdfIn PDF document text
    • http://creptiles.dk/userfiles/file/58862256584.pdfIn PDF document text
    • http://neoclassicalmansions.com/uplds/file/1582817079.pdfIn PDF document text
    • http://cy2hand.com/userfiles/60406378631.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c74bdd815b---lelujozavafepemat.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_off0000b231.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB231 10620 bytes
SHA-256: d9ed29e8644bdba345b3210a60529f95ea706e7d3c96f21b15fc1f1003d4280e
font_01_sfnt_off0000ca77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA77 17024 bytes
SHA-256: 7cfd60fb122f48db7052db607e406dce973f9389ab1f842fd4e077f657efd0c5
font_02_sfnt_off0000f564.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF564 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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