Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d27753d7361377b…

MALICIOUS

PDF

152.0 KB Created: 2021-06-27 14:58:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 37c784b321dd23b8f2b70258888d7aae SHA-1: c20661b4ed25c7091064dbd5678865c5235908ff SHA-256: 7d27753d7361377b52e2c8a311b5d5f6aa06debd90c4dbcfca547ce49e03adfc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9920

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://laborke.ru/uplcv?utm_term=educational+management+and+administration+pdf PDF link annotation
    • https://efsanepin.com/calisma2/files/uploads/voxanuboko.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/9be34618deb089c6844307a9f9a3da2a/64708865110.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b3790454b38---zikalanawetazujumoguvumax.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160788fa6976ff---85561858223.pdfIn PDF document text
    • https://seerupit.dk/assens/file/jazuluta.pdfIn PDF document text
    • http://tablica-nieruchomosci.pl/uploades/fckeditorfile/bufebajitawega.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/34cda3fe098ee3958b6259c8642b4fba/lipefefurepagimugelipelo.pdfIn PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210509041252.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/mo1e8a2ve7ito3fnkehp4s595h/sizeporoxasu.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/jutimedivazovokeseviger.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/b1d96c300518d2b218a6cb9a5d685bc0/48131306704.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083d6ee3fedb---wumagomuwigu.pdfIn PDF document text
    • http://applexin.com/ttpsea/files/file/84881654929.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/mcv30lki71vdjarp4ghb3q878m/24995739240.pdfIn PDF document text
    • https://noriupapildu.lt/ckfinder/userfiles/files/75648764912.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/c9qk1nuceisdbch77e0707tvd3/72883723449.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9f94ca44b.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/b417837752caf11d23032cee8d028154/40338134740.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/cedfd8abf304f74611f08d88f9368aa0/26785010416.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/vuridebatigifejak.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/htupaol5a7ov1ubatu5be0p257/bemumatatosik.pdfIn PDF document text
    • http://biirbeh.mn/images/content/file/1913585012.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_off0001f218.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F218 11044 bytes
SHA-256: 9e0de6312665f993ede85f387700a0837f280faefd108b426771e85f26867eaf
font_01_sfnt_off00020b8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20B8D 18012 bytes
SHA-256: a6d5bd2a330fdc55432450d482ea2a9dc8a7fa2bd42525f5b215ad177464ead5
font_02_sfnt_off000239fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x239FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.