Malicious PDF — malware analysis report

Static analysis result for SHA-256 f419456b67f78259…

MALICIOUS

PDF

80.7 KB Created: 2021-09-03 19:17:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e97edd7a3428108a1004a8704012097e SHA-1: 9ec71d3171dc7a8c6a7eb2858fa85502ff402a68 SHA-256: f419456b67f78259116e4d2cb8a200b9c01ae8a7ae39f72480cd4975b26df0ef
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, including those pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users. The presence of these links and the overall detection suggest the PDF is likely a lure for phishing or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • 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
  • 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://archism.ru/uplcv?utm_term=alice+in+chains+dirt+songbook+pdf PDF link annotation
    • https://ajwatravel.com/wheelmarine/userfiles/file/xamujedulasawufaneg.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/malik.pdfIn PDF document text
    • https://btegypt.com/file/76161245054.pdfIn PDF document text
    • https://tonitomov.com/picture/file/fumipevodevazod.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608165f44b0a3---65848147067.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/24011026351.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/1843273278.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a38406162f4---deradazejopava.pdfIn PDF document text
    • http://solartgaleria.hu/images/file/ravexak.pdfIn PDF document text
    • http://beymersan.org/upload/files/kigezokep.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/ih91ll4v3ov8g2ndilb09eckr7/godonolidalapunu.pdfIn PDF document text
    • http://optykglowacki.pl/obrazki/files/74932937753.pdfIn PDF document text
    • https://eletvital.hu/uploads/files/mamefepolokifubuko.pdfIn PDF document text
    • http://wellfoto.cz/pictures/files/nodopuwusolabejimapotum.pdfIn PDF document text
    • https://semut73.com/contents//files/sisowebabedivudup.pdfIn PDF document text
    • http://paolacaone.eu/userfiles/files/52929065609.pdfIn PDF document text
    • http://ghioroiu.ro/sites/default/files/file/latowarozimaximog.pdfIn PDF document text
    • http://tano-cable.com/d/files/35640040849.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afb73c4c5a6---selafe.pdfIn PDF document text
    • https://sieuthimaycafe.vn/uploads/file/76733690538.pdfIn PDF document text
    • https://tinnituskozpont.hu/files/98309582088.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_off0000d5de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF0 17740 bytes
SHA-256: 03f330aabff42cfdb4364fc9528ab1752c555ea5d2f55aa076edfa0eb9cc6e7f
font_02_sfnt_off00011bb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB5 11112 bytes
SHA-256: cb7199c61f2f57018af73bbbdbb457622d706f8f2a579255e2557a7713168cac