Malicious PDF — malware analysis report

Static analysis result for SHA-256 97ac7ef49fed21f4…

MALICIOUS

PDF

88.4 KB Created: 2021-07-15 11:14:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 8cdf92386d8413796a6990359ca42630 SHA-1: 6a3a8db3822ee2837764649e442c0c65e5bc5993 SHA-256: 97ac7ef49fed21f4aeb5df0f4b70eeb9ea68b841b2b4ff64d632f28597cd8328
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The document body is heavily obfuscated and unreadable, but the presence of multiple external URIs and the overall heuristic profile strongly indicate a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://garglob.ru/uplcv?utm_term=chapter+12+driving+in+adverse+conditions+answers PDF link annotation
    • https://noihoithanhtuan.com/media/ftp/file/40752361604.pdfIn PDF document text
    • http://generaltubi.com/container/ckfiles/files/10460845392.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb94fc99b3---64577805579.pdfIn PDF document text
    • https://ikima.fr/uploads/file/regotidazebobomogozusan.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/7f772ba28d0d56c3c2c0034731945b99/52297168124.pdfIn PDF document text
    • http://pusancard.com/userData/board/file/11377168035.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16098337c243b9---zaranerifabovatifiweruxo.pdfIn PDF document text
    • https://portugaliaimagyarok.com/ckfinder/userfiles/files/12532628387.pdfIn PDF document text
    • http://www.heksan.com.pl/file/kifatujuxiriniwuledinitim.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a38935793d6---71803982076.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b8287f611---pakekitulogug.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/jegirim.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16071f92ead307---samevofojuvodukalexoxo.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/68125053837.pdfIn PDF document text
    • http://arcenevents.nl/site/upload/files/durejifafavugobavegovon.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0ff8a9c25---58247489835.pdfIn PDF document text
    • https://fourseasons.events/wp-content/plugins/super-forms/uploads/php/files/1224997b890caee0a3a13a4136785c15/92177774938.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/587554eef6f9788973088130268140a8/tosowemituxezo.pdfIn PDF document text
    • http://ashioke.com/images/library/File/zasasijabifazedonubum.pdfIn PDF document text
    • http://studioego.cz/userfiles/file/kupiludomiwanuwepu.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a95faf1efd5---96570483246.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160850af46df2d---semuzojipetogi.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/6661902a6abacd9935ab8cfd55b43e24/purowokixa.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/0cc20c7b4bce1b63f860513244b1e4d3/6263345465.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_off0000f53b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF53B 11104 bytes
SHA-256: c090032eddf8f7fe050001f5e2170c7f12c9351572e11857f6096fca75e8860a
font_01_sfnt_off00010f0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F0F 17192 bytes
SHA-256: 5a2afbfed8e933105971721ecc581b16e2ab4e99836911c3bbf982c5ac4e93de
font_02_sfnt_off00013bfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1