Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2fa12ffe3eadb0b…

MALICIOUS

PDF

69.3 KB Created: 2021-09-04 07:13:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3ebfce5c88eaa7f9053fc9d0def8f7c1 SHA-1: daed0b5d0ee72070614623b855321158302812b1 SHA-256: a2fa12ffe3eadb0b32d5af0440ea82947d5f3fef5c82a10d205a6d3abd532017
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external links, many pointing to domains associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery through these external links. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL heuristics and AV/ML detections.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6676

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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://bluetact.com/ckfinder/userfiles/files/denavebezetijixuti.pdf In PDF document text
    • http://medi-sen.com/files/files/63722256981.pdfIn PDF document text
    • https://camelcarpet.org/d/files/nisebosugusetamijori.pdfIn PDF document text
    • https://fonixkoncert.hu/upload/file/38913989984.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b001d4b92d---63244995767.pdfIn PDF document text
    • https://banderlogclub.ru/Files/file/buwogivifosuvuwuto.pdfIn PDF document text
    • http://parvazyab.net/basefile/api203/files/4259563300.pdfIn PDF document text
    • http://benjamin1908.com/clients/f/f4/f4560e3fe432b95d15e234f900dec36a/File/junexomowebe.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16081c40a42f45---xupizosonapifaxi.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/160879c92c521f---jadexukogusiz.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/82e983fec2ed89c17ea3f6d4fef4bc57/sodaputatesinujipeb.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/62de91accf2e4e69ae437f9aeef4e1b1/93087626835.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/59751378927.pdfIn PDF document text
    • http://werkschoenenverkoop.nl/images/docman/files/44178974407.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608d73cb846e7---fozuze.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/21108896541.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a06b663fb51---75339397301.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607d83c8d4625---27394751164.pdfIn PDF document text
    • https://ka-base.no/images_students/files/vididi.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/30acbcbc7e1455025aa28fa66e564015/sejutojasudovixuvabalo.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/12535204781.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=partial+fraction+decomposition+practice+worksheetPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c556.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC556 18156 bytes
SHA-256: 929a721312b65649f1029ebcd38e03753eaca035f5e05f52b1bc33d0063e2bd6
font_01_sfnt_off0000f448.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF448 11064 bytes
SHA-256: 67a66ef6a2e089978394b525bd9b925126f42061d3ce690f6f544e88457d152a

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