Malicious PDF — malware analysis report

Static analysis result for SHA-256 54aca25f588e28f9…

MALICIOUS

PDF

142.7 KB Created: 2021-06-14 02:09:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: bb7b18b294e74655c9118f1cd257fe8f SHA-1: e40681a23a2c73388b449c3c8b1a80697a0ca2a1 SHA-256: 54aca25f588e28f95f0c3937717381f3a312c875896ca48509fdbf5e0315996b
196 Risk Score

Malware Insights

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

This PDF document is flagged as malicious by multiple heuristics and an ML classifier. The 'SE_CLICKFIX' heuristic indicates social engineering that instructs the user to press Win+R or paste a command, a common tactic to bypass macro restrictions and execute arbitrary code. The numerous embedded URLs, many pointing to compromised CMS uploads, suggest a link farm designed to host and distribute further malicious content. The document likely acts as a lure to trick users into executing a command that downloads and runs a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • 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.
  • 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://krisoc.ru/uplcv?utm_term=minecraft+psi+mod PDF link annotation
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607387a16c242---22639296649.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b2903d1414b---kubegup.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/t34neb47956fd7806a3guqjj74/76485450239.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/327ea7c148fc4c58bcd898a7b9828d68/90293213593.pdfIn PDF document text
    • http://bigxra.com/uploadfile/file/2021060408183273499.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/734o5vp01a9fbcsqtk08tull72/bisazovunebiganuri.pdfIn PDF document text
    • http://blackshirts1962.com/clients/f/f2/f245580d3072b78cda2271cf7a7e3f61/File/larajewije.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/922206ca05b5d71fbc0cd415c870cb75/dutukuxugeruwuwexulerav.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/e584f6e70affb63a3cf1e2723aca81ba/92176039283.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/6317f8207a9df63d24df65d3a9b128e4/xosalefagutuxov.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/2fb6f7d39a857aedb1cf1f44292cf538/22151503121.pdfIn PDF document text
    • http://51-lq.com/userfiles/file/%5C/57413714277.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b485b05f517---2146458723.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086425799845---boterimirikegujokozodanut.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a67780e5470---77361449108.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/d47295dc8fcf15be9f1c90fbe3736222/tudewobolokepusotutakiz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000e096.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xE096 85192 bytes
SHA-256: 6d9391d298068a868cbf2e7aeda0ba4a3be0b576e21b9a2d2770ba4b6c4e6f30
font_01_sfnt_off0001de42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DE42 5276 bytes
SHA-256: 1689316baa17ca551e7653e96aa3a6419e655a5c00fa250c9b6c178687733417
font_02_sfnt_off0001f028.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F028 11100 bytes
SHA-256: b77343ff2435a5925f0b139721b600de164b720c3ff604ad673d0132ce0281da
font_03_sfnt_off0002166b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2166B 16064 bytes
SHA-256: 6f41d85279102efce3c4bd26fddb767baf9b68a4f55e239fba9bedc2a2d3b953

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