Malicious PDF — malware analysis report

Static analysis result for SHA-256 637275f9f79bb259…

MALICIOUS

PDF

89.8 KB Created: 2021-08-01 19:43:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1b24418bb4391fb038c43c9a9bd1fd11 SHA-1: d3f80df362113e25845227fc30ffb74105769e93 SHA-256: 637275f9f79bb2590122e7e844382c6606444cb1e13582aaf1450693a7c63be3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm on compromised WordPress sites, suggesting a phishing or malware distribution lure. Although no scripts were explicitly extracted, the nature of the URLs and the detection name imply malicious intent, likely leading to a phishing page or a second-stage download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 https://garglob.ru/uplcv?utm_term=what+size+room+for+regulation+pool+table PDF link annotation
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/950af6930c991230ef134c82f27114f6/rujeduwajemis.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/d980e5bdcf9fd94e44eeb75a0d0789eb/13761574184.pdfIn PDF document text
    • https://ofertaromania.ro/ckfinder/userfiles/files/11706376236.pdfIn PDF document text
    • https://www.visitrwanda.com/wp-content/plugins/super-forms/uploads/php/files/0ce02cbc4398072f0a5c34706617c539/pujedelela.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/eeng4v1vumi1ht9nvb9d1msgh4/23971520171.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160aac1a98f428---zadukadaguvudunisowib.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609279f104cc8---gafemud.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a65413dd3f9---lamoputifomenegejasizilu.pdfIn PDF document text
    • http://druckmaschinenservice.com/uploads/fce/files/jejevu.pdfIn PDF document text
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/ec6phk38kpo9f19h6ng9oppqf3/davuz.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160d860afa2cf9---lopuruvetosepad.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ba3cfd7ea6c---77702237082.pdfIn PDF document text
    • https://aksukartela.com/images_upload/files/wujubeba.pdfIn PDF document text
    • http://alumcity.ru/userfiles/file/33626391822.pdfIn PDF document text
    • https://www.corpeverest.com/ckfinder/userfiles/files/21926179802.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/2307565022.pdfIn PDF document text
    • http://horlickhigh61.com/clients/a/ab/ab3fb267cc30d45b98f460a20cee0b8d/File/zojokigamenimisidi.pdfIn PDF document text
    • https://www.agcontraincendios.es//ckfinder/userfiles/files/7651360870.pdfIn PDF document text
    • http://romangruszecki.com/uploaded/file/ruwiribagiworejewojuve.pdfIn PDF document text
    • http://rosabaum.de/web/editor/files/vutomo.pdfIn PDF document text
    • http://lindseyderence.com/userfiles/files/97690992125.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/ad322e0d4rt4ce9khag25q0s3s/dadepeza.pdfIn PDF document text
    • http://extracam.es/app/webroot/arxius/file/telutufavukupojizedidox.pdfIn PDF document text
    • https://wsbtitan.com/images/file/41587495362.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_off0000fb4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001135f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1135F 16400 bytes
SHA-256: beabed38ad73f5397a7b67962a78171ced5600d08882890a1b8039882ea7dd60
font_02_sfnt_off00013db6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DB6 11100 bytes
SHA-256: 1e9d33a492d6f4bd4b48cf5365f02cb8df2b3ab5fa8bafc147fd45a33f872e4b

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