Malicious PDF — malware analysis report

Static analysis result for SHA-256 db5f125573a4b58c…

MALICIOUS

PDF

86.6 KB Created: 2021-09-07 18:01:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 258c1bf54d694c3449505ae5c5025fa4 SHA-1: 7302e7072e795b30d7ce06607897893fe66c8040 SHA-256: db5f125573a4b58ceeb120f5b98ee9f2d3b075554e8993a884d27d3498ba1bcc
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is unreadable, but the heuristics indicate a pattern of hosting numerous links, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://araonline.hu/uploads/file/62692438469.pdf In PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16080ca44081a7---40727857982.pdfIn PDF document text
    • https://ukmalayalamnews.com/userfiles/file/zikebenugi.pdfIn PDF document text
    • http://sbairs.com/datas/files/95687175082.pdfIn PDF document text
    • http://affordableadobe.com/ckfinder/userfiles/files/bobiwiwumibimuj.pdfIn PDF document text
    • http://osoboebludo.com/ckfinder/userfiles/files/zutelafevibatorazogej.pdfIn PDF document text
    • http://mrhobbscoffee.com/images/uploads/file/kirivubuseloxedazo.pdfIn PDF document text
    • http://annabarons.lv/files/files/nobitatuvuwugorabesax.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/losesuxikovujof.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/5bfd0e4d77a6e183b2556fafc9efdfaf/45141484519.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b55b41430a6---wumotidifozubuvexox.pdfIn PDF document text
    • http://centromp.it/userfiles/files/70913620733.pdfIn PDF document text
    • http://creativetechno.in/userfiles/file/nidibebemitewisazefetopog.pdfIn PDF document text
    • http://lexen.ca/userfiles/files/47385175658.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/917b124547ac1863f066c42870f328ac/41436795055.pdfIn PDF document text
    • http://progetec.org/userfiles/files/nogoloredidugopibezum.pdfIn PDF document text
    • http://livingkaneohe.com/userimages/wonawapovowisosukuvos.pdfIn PDF document text
    • http://cdkkck.com/uploadfile/file/20210803035413.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/21cd1dac78a443b0edf6a1bc569173fd/fuxonif.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134534e439b1---rivufej.pdfIn PDF document text
    • http://clubmaniacr.com/campannas/file/18111491387.pdfIn PDF document text
    • https://xn--z4qq44i.xn--kpry57d/upload/actfiles/60858134986.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/32545513642.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/qtjdmnkbmiifjhrcsqiob7r87q/fowerupipalar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=betel+leaf+health+benefits+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAC 17400 bytes
SHA-256: 04d3b634ab8cf7eff5de620ef8a501ae7306d1075ffbd1669bb7b81767eb5a39
font_01_sfnt_off00011cd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CD7 10568 bytes
SHA-256: 532c92362d2ad213a4ba5a366228d7dd9ce77cc7821b585e74d6c0b3e01aa434
font_02_sfnt_off000134a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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