Malicious PDF — malware analysis report

Static analysis result for SHA-256 f74ecaab978f5fdf…

MALICIOUS

PDF

87.9 KB Created: 2021-09-11 22:24:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c3cfa2494829b040f85e858d8ad64be8 SHA-1: 26bc00fbd55cbcd0ac63b82a8d94da4c8a035301 SHA-256: f74ecaab978f5fdf243e5f630457670b10eb3c3672f859ae7ab46adc7b4e4668
204 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to external URLs, some of which are hosted on compromised CMS uploads. The 'SE_CLICKFIX' heuristic suggests the document attempts to trick the user into executing a command directly, likely to bypass macro restrictions and download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://synerhu.ru/uplcv?utm_term=mortal+kombat+11+pc+torrent PDF link annotation
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139b305222dd---70878783293.pdfIn PDF document text
    • http://hide-bo.com/img/tmp/file/lugizirokadunodagosudum.pdfIn PDF document text
    • https://tourpon.kr/FileData/ckfinder/files/20210902_A0EA7B00E6D8423A.pdfIn PDF document text
    • http://seyrimerdin.com/userfiles/file/65107823672.pdfIn PDF document text
    • https://metnar.pl/web/uploads/files/bofupezejufizugorodokitu.pdfIn PDF document text
    • https://erdemlerkoleji.com/resimler/files/sififuvefepozubar.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/7582196262.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/mifuxoximanibimobejuxuxid.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/161302f01a064a---44045476429.pdfIn PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/pufunamodepezetuv.pdfIn PDF document text
    • http://karlsbach.de/userfiles/files/tirefemukogo.pdfIn PDF document text
    • https://moiatakashta.com/userfiles/file/90089860183.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/41060d3be626fa261370c9fbc1c6183a/purojefitivuxajudated.pdfIn PDF document text
    • http://vinhthuan.com/upload/files/52230745846.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/butujizo.pdfIn PDF document text
    • http://sieuthimaynhapkhau.com/upload/files/wopugafirosaja.pdfIn PDF document text
    • http://xn--76-6kca8aqc6c.xn--p1ai/pic/userfile/73693706412.pdfIn PDF document text
    • http://twgo8.com/uploads/base/files/202109042200429982.pdfIn PDF document text
    • https://mvmdigital.gr/files/files/14345199097.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/qg06ridpsf5q98up28pn8oeo6c/moxotenojukezepaxilak.pdfIn PDF document text
    • http://numere-mopede.ro/mm/file/vibafotifukagevisap.pdfIn PDF document text
    • https://sfeerweter.nl/userfiles/files/gunifupodowigodorutobi.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/32300535514.pdfIn PDF document text
    • http://emeat.ru/var/files/3411691077.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/fawuriwupoxolirobubose.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_off0000ea26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010238.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10238 20916 bytes
SHA-256: 1a00aca6d85dd08728e12b382c43d6206d27b7121f26881acee8bdcf9c2902b8
font_02_sfnt_off00013890.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13890 10552 bytes
SHA-256: 73438059d5862dbaf614c9810cde7ac8cb45839c8170b0a420f947da572f92e0

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