Malicious PDF — malware analysis report

Static analysis result for SHA-256 1623e1abb1b7bb5e…

MALICIOUS

PDF

82.5 KB Created: 2021-09-13 17:36:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3852bb965c05ac8e03a0ef0e9e38c4a9 SHA-1: f64b99de3cbec4586a35c98ff625493c25f547e9 SHA-256: 1623e1abb1b7bb5e20fbae8566bc29a110f96c75a6a8300cb4c620537f07c397
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains a link farm pointing to multiple disposable hosting sites, many of which are compromised WordPress uploads, suggesting an attempt to distribute malicious files. The presence of a 'download' button heuristic further supports this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://eghamatkade.com/basefile/eghamatkadecom/files/76620002108.pdf In PDF document text
    • http://realcomfort.ru/content/upload/file/zutevulunule.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1613f222c144b6---kilafuborulijido.pdfIn PDF document text
    • http://tipsclubcr.com/campannas/file/betezilano.pdfIn PDF document text
    • https://shoppe.everybodyisnotdoingit.org/gift/userfiles/files/96914407333.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/lemomerifatiluvasum.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161346c789a81d---48319479106.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613658dde6edb---23602295360.pdfIn PDF document text
    • https://glozor.com/userfiles/file/fojewavejo.pdfIn PDF document text
    • http://dzstock.com/Upfiles/file/pajamaredizuniwiv.pdfIn PDF document text
    • http://zkqzl.com/uploadfile/file///2021090522142872.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/felemazajo.pdfIn PDF document text
    • https://healthmatters.me/userfiles/file/wosonekazowazuwivowimovi.pdfIn PDF document text
    • http://ckud.handysociality.com/upload/files/7979485743.pdfIn PDF document text
    • http://imoroz.by/upload/file/rijujoworexurufafodur.pdfIn PDF document text
    • http://electriccityusa.com/images/fck_uploads/file/kekotekulubuxoponabixabul.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/gukasubu.pdfIn PDF document text
    • http://paitoonbox.com/userfiles/files/78887750042.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/07161165871bd63b861701a71443e0c5/votowagu.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad4b1938fc---xuvasepiremaginob.pdfIn PDF document text
    • http://perevodvnegiloifond.ru/pict/file/kirosufur.pdfIn PDF document text
    • http://vidol.nl/userfiles/file/wuxuzapiremidexuxotego.pdfIn PDF document text
    • http://hadt.vn/upload/files/lawopojozoxapanunewu.pdfIn PDF document text
    • https://iqmuseum.mn/uploads/files/75031052596.pdfIn PDF document text
    • http://kondicionery-shodnya.ru/upload_picture/file/fuvawel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=subway+surfers+unlimited+coins+and+gemsPDF 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_off0000da7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA7A 11332 bytes
SHA-256: c584729a038e2c73f446865c979ac261a0c835d46903463da8f3ab416a5741ec
font_01_sfnt_off0000f4f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D08 17928 bytes
SHA-256: 8a2bb6de04800bc9040f33761d302ae6518028b72e2be48e0919c350b1face6d

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