Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab9ea2e87ed4ff35…

MALICIOUS

PDF

94.3 KB Created: 2021-06-27 02:08:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 061800248f69eea40d05b22f96c99a8a SHA-1: 3edd3732e6b62e1476dea4bca2ca3c90099498b5 SHA-256: ab9ea2e87ed4ff350f11accdd4ab32c8567409ab3da6dcf6378939c4cce2e82b
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. Heuristics identify it as a link farm, with multiple URLs pointing to compromised CMS upload directories. The document body is heavily obfuscated and unreadable, suggesting it is not intended for direct user interaction but rather to host or redirect to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160bb27352f905---48588502212.pdf In PDF document text
    • http://clinical-pain.com/pds/userfiles/files/31417882993.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a1bea7e4cd3---gitoradodopa.pdfIn PDF document text
    • http://cascinamana.it/userfiles/file/53293835722.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcaa47886ef---72165051227.pdfIn PDF document text
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/49152442761.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/ah8jmmrpu11kppn2ckb6632b72/jumezedigajozaneviwos.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/nukumibamut.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/ba8b21158a3d95c5bec8134013e3be44/70330193629.pdfIn PDF document text
    • http://eurekaelearning.com/upload/news/file/pozodowi.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/vejamugujepojonajadib.pdfIn PDF document text
    • http://harryreichert.de/uploaded_pics/News/file/bosulenepurubis.pdfIn PDF document text
    • http://tdvvietnam.vn/webroot/img/files/77246554605.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b9b2e942c---jomebeganobamugeraxofexaj.pdfIn PDF document text
    • https://people11people.gr/uploads/File/64279708511.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608397d733c70---93921469297.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607193c592328---zajosonitodifutulisazipi.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ae6797793c---6931984903.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021052609512499.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/9879cc352d3d67c0f6059a40556419dd/vodaposefisozubuge.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=congruence+of+triangles+class+7+questions+and+answers+pdfPDF link annotation
    • 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
font_00_sfnt_off0000f2d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D0 18304 bytes
SHA-256: d43024c5a5263eda576d394824b308a59650b568671e8f205ab1b7016b1449c7
font_01_sfnt_off0001236e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1236E 11208 bytes
SHA-256: 47eb1356158f4f469e14c6b8994a496ad42d6163f89d4de8241b335fc53115fb
font_02_sfnt_off00013d74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D74 16224 bytes
SHA-256: eaa8f7992a66b169018bd4070535e3ca6e8281efd873ad763ad8d95c2b179690
font_03_sfnt_off0001534e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1534E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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