Malicious PDF — malware analysis report

Static analysis result for SHA-256 89a26cf68906a537…

MALICIOUS

PDF

89.0 KB Created: 2021-09-06 16:55:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b4f958a26f7b90df4a1654ff43354f5c SHA-1: 2fd3a1021b10705aaf4ffdd3299c1cbcec812f69 SHA-256: 89a26cf68906a537642da5b920abdb8be9a7bafeff75ce7861295ea7fb29fe93
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of embedded URLs, many of which point to compromised WordPress sites or raw IP addresses, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, indicating it's not intended for human readability but rather to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/6f8b550f9924f7d2bce8030bb0c1e8ba/ruratedusoxakalopanefoje.pdf In PDF document text
    • https://ihotel2b.com/upfiles/editor/files/kizanuserevofobi.pdfIn PDF document text
    • https://medarbindia.org/ckfinder/userfiles/files/fetezojo.pdfIn PDF document text
    • http://chinastom.ru/userfiles/file/24325177097.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/f19b3c12bc97c408f707805489dfd9b3/48457058131.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/moviduxuvoboxugibavu.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/ae36a46722b8231d887f8cdf62432278/dupuvegavapozo.pdfIn PDF document text
    • http://inbeeldt.nl/userfiles/file/6757354267.pdfIn PDF document text
    • http://ourhkg.com/UPFILE/userfiles/files/91015621600.pdfIn PDF document text
    • http://cpgny.com/userfiles/files/dosebatobuden.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/4f434fe8feb230cdcd75c06251c01208/6538495821.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/75087f8e89027af3be9b0e0a5f6d0886/refovomeruximubigix.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088b1044410f---962450297.pdfIn PDF document text
    • http://graviroz.hu/ckfinder/userfiles/files/lipok.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/f231a544b6d4a3203e7edb65194424d4/90600780823.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1609af83ad6f37---lamij.pdfIn PDF document text
    • http://gyuco.com/uploadfile/files/20210809_104531.pdfIn PDF document text
    • http://livelyway.com/ckfinder/userfiles/files/rewamos.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/40433992234.pdfIn PDF document text
    • https://catwalkdogcome.com/editor_upload_image/file/99269361820.pdfIn PDF document text
    • https://lmcmanager.com/ckfinder/userfiles/files/bubitotovoritivarer.pdfIn PDF document text
    • http://140.121.180.103/ckfinder/userfiles/files/69761388260.pdfPDF link annotation
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/0cdgk6ros2stt4j9c4mei5vd75/jumufav.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608edb549b359---vevibuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=skf+shaft+alignment+tool+tksa+20+manual+espa%C3%B1olPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE64 19484 bytes
SHA-256: e8faf4d157b7b9ba1b2f849a5ab900c96e22b3098e2d7d57ef2e3b9f0b84d4b3
font_01_sfnt_off000121ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000139c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139C3 11420 bytes
SHA-256: 0084394721aef933dc065f5baf094de6a2c1cbf7d2b8e9b969a965fb90899260

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