Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8c7b82c66489c54…

MALICIOUS

PDF

87.5 KB Created: 2021-07-17 19:46:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 622cce7ec2e946a2b749abd6dd4fb801 SHA-1: 037172394769e61240ec9d04d9605b823377e8a6 SHA-256: c8c7b82c66489c547d15c77ebc5cc719d2e53f5e8eb27a825ba175ffc343f30a
156 Risk Score

Malware Insights

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

The PDF was flagged by ML and ClamAV as malicious, containing numerous links to compromised WordPress sites and disposable hosting. These links likely serve as a link farm to redirect users to malicious or phishing content, consistent with a phishing or malware distribution campaign. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1bb7bfae8---89252569775.pdf In PDF document text
    • https://aokman-drive.com/d/files/notaxilesugutatinagojomik.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609acc43677f2---67889878067.pdfIn PDF document text
    • https://koncnc.com/genelresimler/file/wesavojeleb.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/melopixadugidi.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/nads533n8h9246ejqus596j345/91525024180.pdfIn PDF document text
    • http://kolasinprevoz.rs/slike/files/gejexub.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c66cc8c6399---litekibonu.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a606167a40c---38383972624.pdfIn PDF document text
    • http://xingyeknitting.com/userfiles/files/62350673746.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/gaputijofoxalu.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f039d9640a---jagefirexupu.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160903a4f2cd93---74448733955.pdfIn PDF document text
    • http://vidol.nl/userfiles/file/vunetiteseropikavopuwa.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/megejilajepefefur.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/740106dc572dc63b8d1c13a7afddf9f2/97074123275.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/rorikap.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096676a6053e---pasagedafixagugiji.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/br2kp0cph48f49609jqj28q0h6/74491450437.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/76531298816.pdfIn PDF document text
    • https://anctools.com/ckfinder/userfiles/files/vezowe.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072f7c9a6bb4---bikejof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=scion+of+sorceryPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e80f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE80F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010026.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10026 10212 bytes
SHA-256: 6106a0540508459d0b40638c16bd66cedb0ed3cdeb1af601f95352dea7a552b2
font_02_sfnt_off00011721.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11721 2672 bytes
SHA-256: b21f64a35ff79df1f88c1e3e15a2aa71189aacf327d39b413350ddcfc82386c1
font_03_sfnt_off0001228f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1228F 17776 bytes
SHA-256: 397cec8f1d9b7d94bcafe1f0e79f801402da9a80b8fb8dded3ae99d8cc87e818

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