Malicious PDF — malware analysis report

Static analysis result for SHA-256 d826721d227a4420…

MALICIOUS

PDF

104.9 KB Created: 2021-08-15 05:57:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f194ee2480861db8c789c5d1946ea878 SHA-1: 68e1425c42a98223ec71a06f2a5d7220a7d5bf88 SHA-256: d826721d227a4420961364a5cbd644512736b1ec608fb2d287188b95b0770d83
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, likely leveraging embedded JavaScript for exploitation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9906

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://irlanc.ru/uplcv?utm_term=khilafat+aur+malookiat+pdf PDF link annotation
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/38e51b0cfeeaf1c218684d5acb35f3fc/sulusovo.pdfIn PDF document text
    • http://bukharageorgia.com/sites/default/files/file/44129787154.pdfIn PDF document text
    • https://miguktour.com/FileData/ckfinder/files/20210728_47BCED31BA727121.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16117cfb657cb1---53955635844.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/3516948f47e92231f58a386dd692d4ac/38610475979.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/18681393128.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f49d12bb88---84243157970.pdfIn PDF document text
    • http://metrocars.london/survey/userfiles/files/xupenoxezewif.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2cf11a6b8a---wuxudimanekobeloxilexitaz.pdfIn PDF document text
    • http://whalesart.com/uploadfile/file///2021051609314710.pdfIn PDF document text
    • https://euinsuti.ro/app/webroot/files/userfiles/files/5479825644.pdfIn PDF document text
    • http://blueyee.com/upload/file/250919011503.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/jenitomu.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1610d31fe3bf99---jabobexedugeje.pdfIn PDF document text
    • https://auto826.com/uploads/files/betefuzebopumikexa.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/72083f68831258925f86f4471569ff65/tavedosil.pdfIn PDF document text
    • http://drsuthichai.com/userfiles/files/47667809784.pdfIn PDF document text
    • http://teplolux72.ru/upload/file/zetetivexojakefuropebeku.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608082f7c8fbd---powuzotazinu.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160d018f64bf11---19027441775.pdfIn PDF document text
    • http://ippon.lv/uploads/File/bemepafaxatazaj.pdfIn PDF document text
    • http://adbuffalony.com/uploads/files/rakur.pdfIn PDF document text
    • http://ahchala.com/img/file/91638844095.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off000150cd.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x150CD 23800 bytes
SHA-256: c636a624f08d57271ee4a0927d9b35bf73bfa4431f24ebd4d53232c68d675dae
font_00_sfnt_off000107ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011fff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FFF 18616 bytes
SHA-256: c674651ccbe8e4f430d94071602b82279ca9e50619a6938832c073e6bb35b388
font_03_sfnt_off00017bf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17BF5 10544 bytes
SHA-256: 06ffc2ed33ba67a044ba9f01b03ca413e95582f288d1c8ae191cca57a1db737e

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