Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd57c0bbb38bca13…

MALICIOUS

PDF

102.5 KB Created: 2021-07-06 15:07:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 2eaa6bd5e9914d8e94958a1ebae8f7fa SHA-1: 6262a5e2d3202bf1fb6e151fcbdbc9380160c00d SHA-256: cd57c0bbb38bca136abc9cebe30c72e65342acee9487cb4384a937b7eff42cc6
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites hosting PDF files. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The document body is heavily obfuscated, preventing a clear understanding of its direct user-facing content, but the overall structure and URL distribution suggest a link farm designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://ketchas.ru/uplcv?utm_term=accounting+information+systems+romney+14th+edition+pdf+free+download PDF link annotation
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6592ecad41---lusudovomemifidon.pdfIn PDF document text
    • http://seamacros.com/upload/file/20280079675.pdfIn PDF document text
    • https://landi-bg.com/images/file/64447329761.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e570e0680---93265908109.pdfIn PDF document text
    • https://travelinnsuites.com/nbloom/fckuploads/file/32041003066.pdfIn PDF document text
    • https://proxus.nl/file/zekowakiwerifipomuwil.pdfIn PDF document text
    • http://toyotaquangninh.org/data/dulieu/files/81422989674.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/61650413235.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606ebba4c4eed---fapiwejiwavilajojune.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/86424202742.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/707693282.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609daec474c12---jixaxalamobap.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b6d36638f---49925713468.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/a37a99e6a9747e0ca36abe35057d46a5/lubujola.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f08ea01d73---54030047878.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/mh87vmicr324droeokt9sv81br/forezepoxo.pdfIn PDF document text
    • http://shuswapladystriders.ca/userfiles/file/suxulelidiz.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/f8189488b49378fdd3a8a7caaba0d766/17159876503.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/49853258197.pdfIn PDF document text
    • https://airtelco.com/data/users/_/email/files/81822091456.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/b994a60795eb195bd06a8bb85e89dd6a/tilarudenatiw.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/i7e0sa5kcl50rb9s9rm4nuqfl8/72239163263.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_off00012b3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B3B 17688 bytes
SHA-256: a6712b5fe7362a58e58281c1bc098f59b78f6c9cc9a04a46f4aafe14440894bf
font_01_sfnt_off00015948.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15948 11480 bytes
SHA-256: 4c38635988881c051af697a0390d47ed55e21bdd30e8a42d163e0ea0509ccd4b
font_02_sfnt_off00017445.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17445 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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