Malicious PDF — malware analysis report

Static analysis result for SHA-256 18ef20066a9c55c2…

MALICIOUS

PDF

101.1 KB Created: 2021-09-04 13:51:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: 98b5ebc68d8e21fadbd182b94da7938d SHA-1: 2850921274fdf426b136af58a86c70a3070279b3 SHA-256: 18ef20066a9c55c2dbb362db7536f2c3f85efec7199bf0050404f4f72482a5a9
184 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. Multiple heuristics indicate the presence of link farms and external URIs, including one pointing to a raw IP address and others hosted on compromised WordPress sites. These elements suggest the PDF is designed to lure users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://wumag.pl/userfiles/file/junat.pdf In PDF document text
    • http://157.230.241.115/image/upload/File/7093239427.pdfPDF link annotation
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/4875605c8bd8933b7372865594e3c401/xedigut.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/qho2850tn4a48bo0d1p76dqj42/40570362431.pdfIn PDF document text
    • https://ka-base.no/images_content/file/48810970631.pdfIn PDF document text
    • https://italvaping.com/file/31875698414.pdfIn PDF document text
    • http://les-dvorik.ru/userfiles/file/91174610811.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/3597553d61a7a7675caddc36e97c694e/woximigadagiluzasul.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/pudunanamesexapasewiwugi.pdfIn PDF document text
    • http://mvdeastudio.it/userfiles/files/56738592525.pdfIn PDF document text
    • http://gamax-motor.cz/data/dokumenty/56418934143.pdfIn PDF document text
    • http://minhledtran.com/luutru/files/lebana.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/c68gfckihsdsek8man9qkpsfb7/87905279367.pdfIn PDF document text
    • https://argumentua.com/i/file/69308368926.pdfIn PDF document text
    • http://garagehayashi.com/js/upload/files/kiwigalanoporabuzaw.pdfIn PDF document text
    • http://techbis.pl/files/file/fagapuwexipas.pdfIn PDF document text
    • http://foodchemsino.com/d/files/lewikoxutomesasi.pdfIn PDF document text
    • http://tafgambiatours.com/userfiles/file/10281826877.pdfIn PDF document text
    • http://stressmanagement-karriere.de/userfiles/file/ritetumubive.pdfIn PDF document text
    • http://techcessgroups.com/userfiles/file/21724776208.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/2b7e18e1f00030845f0ad533553dd4a3/kojexigumawuporur.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/998ba2b2168522b7216f29c77efeeeed/jumevirarotabopoji.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077a5e4b658f---77520966213.pdfIn PDF document text
    • https://blugarden.eu/file/85447987671.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=tonight+west+side+story+satb+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_off00011d7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D7D 21100 bytes
SHA-256: 033cc99b92338d8e424c4f36738e669a1a2ff060415b87806c3dfea232c2eae7
font_01_sfnt_off00015556.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15556 11032 bytes
SHA-256: 4027ac91c9077efb12a19014afac53c80beb07ed4575fba556a681f88f1db975
font_02_sfnt_off00016ea4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16EA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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