Malicious PDF — malware analysis report

Static analysis result for SHA-256 d61151b78a05c817…

MALICIOUS

PDF

116.8 KB Created: 2021-07-13 10:08:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 3eba9dab1b5582a0ae3a587a3a88a42c SHA-1: efd277ff98e1e3d2b78714492aa2ec7a1153f893 SHA-256: d61151b78a05c81727f83c1c24bb92a62000e518e052ff12757d68107d16a2b9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm hosted on multiple compromised WordPress sites, as indicated by the 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or redirection to malware. No scripts were extracted, and the document body was unreadable, but the URL structure points to a common tactic of using compromised sites for hosting malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9615

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://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6d580f05d---97479378720.pdf In PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094659f5f852.pdfIn PDF document text
    • http://refah4ter.info/basefile/hotelrefah4terir/files/pamozovupazawuxazuf.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160c89aa66f0b2---nidalujedefoxa.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/9882u05qt344svr5gql38t7rn2/57715649310.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/wasidadagilizofiguv.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5b794f665---rufanilalup.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/07e8ae1c7b2accf1c6575024b2f686dc/9015018175.pdfIn PDF document text
    • http://carrozzeriardue.it/userfiles/files/wamiwijoteso.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/4gpggars7h6cja6274cujmu623/nanek.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/58971928252.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/04b4873216978569d86259fd6daa5feb/95514197749.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c65fc77b5---lananowobomokitodopaki.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/c81bc6847337412a73d63e95248c26cb/12909284991.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/cc71c4cebb78eea7b68cd147c0d61cd9/74809463326.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/2a0c51b8773dfca35634f669bfb9e6c9/tolelezalasor.pdfIn PDF document text
    • https://theurbanthinktank.com/files/dovipar.pdfIn PDF document text
    • http://tjsijiqing.com/ckfinder/userfiles/files/2021/0610/8b6f1da21bbb89619d14a7e8b110bc8e.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607247c5eefb5---34401405684.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/7m7573g80g93i2u3qfulvkvl50/80301510935.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/111f1c8a2f4510f16fc3d7105eed3937/65326335052.pdfIn PDF document text
    • https://cristalensi.com/public/File/77313256267.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/d1f7e8c044f02bf531fdfdb450ae0f71/jiriropitewejubop.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/de8797f1ad92f5363f68a0978342a4a7/54778407493.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=haskell+list+findPDF 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

Related samples 8

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

Full JSON: related samples API

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013e0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E0E 18552 bytes
SHA-256: 9feed9be9f7f7bb670a87bae22c3035f3dab8286ab023bbec34d316c23fe80e0
font_01_sfnt_off00015bf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BF5 10208 bytes
SHA-256: 59ae787db04d65a226d67da4e97f78a4524a2a3a4f79009b955b7227014ecf96
font_02_sfnt_off000172ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x172ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00018afa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18AFA 1808 bytes
SHA-256: 72b66b6ac1c8391419efe08ed3db8984cb3f58026c8012adfa5df74b8e42b344
font_04_sfnt_off00019358.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19358 18700 bytes
SHA-256: 2427f5fd3fc5206af198ac9c8ce890b06180594b19c494eb8c14906e81c3c6b2

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