Malicious PDF — malware analysis report

Static analysis result for SHA-256 accfd7690cd04baa…

MALICIOUS

PDF

78.4 KB Created: 2021-08-12 04:32:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 77cad126866b9b14ba515c86511df3c7 SHA-1: 9f8d9df900cd8efdf03f051d59a79e0513d02912 SHA-256: accfd7690cd04baa1c4da7bc8b5172c234fabd8944ca96eac1f10f6505d06444
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that contains numerous embedded URIs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URI patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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
  • 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.
  • 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=how+to+set+a+tough+solar+illuminator+watch
    • http://frigotechreina.com/userfiles/files/27765238470.pdf
    • https://hglobaltourb2c.com/FileData/ckfinder/files/20210618_16765C364174F3C4.pdf
    • http://ahcxdq.com/uploads/file/061600129188.pdf
    • http://gapoom.com/upload/fckeditor/file/gofula.pdf
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608340d0cfa2d---raxowekomazelenaludebif.pdf
    • https://cometsecurity.in/admin/userfiles/file/rabagafotivini.pdf
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093d0dd6338c---jekagedakakoxarafonen.pdf
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9023a8e66---zorekuvapimiza.pdf
    • http://hakkabrothers.com/userfiles/file///69327377133.pdf
    • http://eltdb.com/UserFiles/files/99107184402.pdf
    • http://centrumbiznesurawicz.pl/userfiles/file/37748058324.pdf
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/28c8c6f2fe3c98624fdee1821f75ea8d/wigufalitefepixi.pdf
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc3d17599b---datonozosajo.pdf
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/fbcc88b0fed5b8299cc732fa39df7b09/junaki.pdf
    • https://banktapeunadana.com/tapeunadana/bank2/admin/userfiles/file/bijozesokaniraputemoxi.pdf
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160746894dfa64---36107758470.pdf
    • https://gofropack.com/wp-content/plugins/super-forms/uploads/php/files/a4a2c9d5d64861d27c9f37477b35fa47/figokutumekamuru.pdf
    • https://aksukartela.com/images_upload/files/ralixilejitit.pdf
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/002d900d84d31adecc8e70d6dff2cfb0/88525798126.pdf
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2bec75576---7434040609.pdf
    • https://leosservices.com/userfiles/file/35277659255.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7bf7be897---60121926279.pdf
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d7c0b03855---fezuwiwedibanugawefo.pdf
    • http://urjabatteries.in/userfiles/file/71857322179.pdf
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/eroc7l8cr7ra06rik90bbj57q1/tomajeximomolenewad.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca5a.bin
00231f72091bf5a5d3ba399d00b46b8446803552f9fb5babb9bb4539b457de9e
pdf-font-stream PDF embedded font (sfnt) at offset 0xCA5A 17820 bytes
font_01_sfnt_off0000f8f2.bin
000cb2700f636d260859a77d84146cd7c104592ce2e9e9206a7097352162aa8a
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F2 10856 bytes
font_02_sfnt_off000111de.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x111DE 16792 bytes