Malicious PDF — malware analysis report

Static analysis result for SHA-256 451bfce99da37836…

MALICIOUS

PDF

133.9 KB Created: 2021-07-02 21:48:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 9709d3ca0d1116e0dcf9558b45385878 SHA-1: dc5c6c34848e8c0ba200de8bcb5b4df7a23c7f74 SHA-256: 451bfce99da37836ae15384529170d281056c87fdc2077f80618bb7453b5d45e
176 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised and disposable domains, indicating a phishing or malware distribution attempt. Heuristics indicate malformed streams and exploitation, with ClamAV detecting it as a phishing trojan. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://inwebjor.ru/uplcv?utm_term=lynx+and+hare PDF link annotation
    • http://adabaskimerkezi.com/upload/file/33375103074.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609358e73e3e2---lajimejepibipelutej.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/26570077751.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/bavanisoxasodemivali.pdfIn PDF document text
    • https://keluargamimpi2.com/contents//files/zukusi.pdfIn PDF document text
    • http://fullx.net/files/dabavisawutejuxivegiti.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608689304a77f---xapikolofaf.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f0db68a989---91007950602.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bb75974828a---46330870877.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/68e97488ae497e42d788e60b0de37bde/buvib.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/f7d929952c3c4e980cd33676953ae85b/95105141307.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/41d30c9c3d8a8c201e335d23b039102f/titokekagujibodu.pdfIn PDF document text
    • http://rolmech-strzelno.pl/Upload/file/60769149175.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/kco3aavtuvafvsgl2628h04n6k/bivipesafudobagowewigidi.pdfIn PDF document text
    • http://hurtowniagrafit.pl/userfiles/file/50332376860.pdfIn PDF document text
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lonaxezexajarobidisel.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/n9i68ja1do00fmtqu2onbab404/bezavijasiwirubotukevakir.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160c5f5b634aed---fibopegawavexova.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2f3aa3fb8a3f4cb89e90a5e92016ed69/mukipoki.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c164498fd7---xegag.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609a866ce188a---31814323771.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/4h9esfjd9i80v2ou9g6i2d0jfs/wiwezudakupalavawumu.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607bde1e2f372---54461825613.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c754b6c4b1c---vekodawi.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/snqsfo94l49edv5quoor14kco0/41222040506.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_off0001ac7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AC7A 18236 bytes
SHA-256: 00d57911fd05bbae5e5492593ba954a482cc7c30a767d89df4aedd0b58ef539b
font_01_sfnt_off0001dc21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DC21 9992 bytes
SHA-256: 80fa4f102d9fad69f6c9ecc5aceba11656b3c6d5840a414af36f3cd07d3682b2
font_02_sfnt_off0001f227.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F227 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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