Malicious PDF — malware analysis report

Static analysis result for SHA-256 544950cb3390ff92…

MALICIOUS

PDF

84.1 KB Created: 2021-09-03 17:25:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 93b004237ef88d17c4fc558aaa3d8f4f SHA-1: 250a5f1a897a52de5459ad96568c646fb7b957a1 SHA-256: 544950cb3390ff92aa7183fc3aa1deb1e97956bce23f5a8d04264afd89e092aa
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document was flagged by multiple heuristics, including a critical ClamAV detection for a phishing trojan. The 'SE_CLICKFIX' heuristic indicates a social engineering attack that instructs the user to press Win+R or paste a command into a terminal, likely to bypass macro restrictions and download a secondary payload. The numerous embedded URLs, many pointing to compromised WordPress sites, suggest a link farm designed to host or redirect to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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
  • 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.
  • 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://queure.ru/uplcv?utm_term=logitech+mk540+advanced+wireless+keyboard+and+mouse+combo+manual PDF link annotation
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091e721cc8ec---48315379509.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608951fd85bd2---jogidazodufofajilodin.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/vodefasudamaginibele.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a79fd9217ca---62042345581.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/16093baf7646b0---vibekamuxuseti.pdfIn PDF document text
    • https://www.nstoplana.rs/ckfinder/userfiles/files/zimutuxexurimodude.pdfIn PDF document text
    • https://kopari.hu/files/file/figivab.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/b5cbcbfe4dee78451e6a7438b6417b80/4465606191.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/xusotevotogininipobop.pdfIn PDF document text
    • http://designgaleria.hu/userfiles/file/rumabosidutolefobafo.pdfIn PDF document text
    • http://thuduchouse.vn/pics/file/94859906785.pdfIn PDF document text
    • https://betenagro.com/sites/default/files/file/zolefoxirodikamaduzonun.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16084f6c2e2227---mimifixipedeguziwevef.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/3f25bfb9c60f376031c6168a987d9531/50269991009.pdfIn PDF document text
    • http://unnatiwelfareorganization.com/ckfinder/userfiles/files/72692410707.pdfIn PDF document text
    • https://alienaquatics.com/home/gb/public_html/ckfinder/userfiles/files/89142172246.pdfIn PDF document text
    • http://asokmontridental.com/userfiles/file/81137405949.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4aeb3bf91---35467631597.pdfIn PDF document text
    • http://essuances.com/ckfinder/userfiles/files/bikavufemigofe.pdfIn PDF document text
    • https://www.jedeminute.de/wp-content/plugins/super-forms/uploads/php/files/he341jcmpqa5ehq73lt62age2f/korudawesumugibovezu.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/b05a0a39f893b843359affb11777dbe9/gowiwuvotowelumegugekasup.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/jigasexalinuxixerogegapog.pdfIn PDF document text
    • http://solarexperten.ch/fckeditor/editor/images/file/14952899497.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce0ba24d51---gaxikoto.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/7e20df0827d7c18ab6ac85cda232dff8/84089039230.pdfIn PDF document text
    • http://lixupeng.com/uploads/files/kipafivagubomezirutogimel.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_off0000e0c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D9 11708 bytes
SHA-256: 17d1701e492e34c2910c864ca761179b309f598ecf18b00d33a70f65126faf3f
font_02_sfnt_off0001147c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1147C 17424 bytes
SHA-256: d85b177865f8da7bcf1a1d9142d271c2e9ca35ed143c9b44ceef3ecd39d12c7b

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