Malicious PDF — malware analysis report

Static analysis result for SHA-256 86b9a55259907b9d…

MALICIOUS

PDF

76.9 KB Created: 2021-09-09 12:13:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e5ff8b9184451395f2bb7f806bcdfb80 SHA-1: b3b5dfc0893735c5da5a55cc3247400cdd1d3c34 SHA-256: 86b9a55259907b9dc5a4284f0871d12868c0b16be53ffd65f9ddcc96f7b08d8d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It functions as a link farm, containing numerous URLs that point to various websites, including those hosted on compromised CMS platforms. The presence of external URIs and link farm heuristics suggests an attempt to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://pixomot.ru/uplcv?utm_term=convert+and+download+youtube+videos+to+mp3+mp4+apk PDF link annotation
    • http://marathon-gexin.com/Uploadfiles/files/vavaxamij.pdfIn PDF document text
    • https://tapuionoticias.com/ckfinder/files/58913790822.pdfIn PDF document text
    • http://pro-elec.ru/ckfinder/userfiles/files/wesozivujofebedirunebijep.pdfIn PDF document text
    • http://atamergranit.com/userfiles/file/tatiwab.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9e9cef7d6---49463905583.pdfIn PDF document text
    • http://kingbikeonline.com/images/upload/File/12186637214.pdfIn PDF document text
    • https://ifbscalidad.eus/files/galeria/files/dowefeluvirogitopam.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612f084b7c5f0---30942476136.pdfIn PDF document text
    • http://otevrel.eu/ckfinder/userfiles/files/69618347420.pdfIn PDF document text
    • https://markyatirim.com/resimler/files/24358706602.pdfIn PDF document text
    • https://mallorcaboom.com/res/wysiwyg/file/lalujafixezevemovumiso.pdfIn PDF document text
    • https://onlinendttraining.net/files/xutobewize.pdfIn PDF document text
    • https://bdblue.com/ckfinder/userfiles/files/losatu.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/82326999856.pdfIn PDF document text
    • http://tabbanbros.com/admin/fckeditor/editor/filemanager/connectors/upload/file/nodowemigurirasamami.pdfIn PDF document text
    • https://slicktechproducts.com/newerac2c/userfiles/file/54288328548.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/nagamoxuboraregidatozakoj.pdfIn PDF document text
    • http://stepasidemedical.ie/images/uploads/file/37988263593.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/7d5544fdbdb6308c26179d7dd2561574/wejisam.pdfIn PDF document text
    • http://jogagongu.pl/userfiles/file/nojujisipodokolewijufas.pdfIn PDF document text
    • http://eraldocomo.it/userfiles/files/tipitivivexulezubuxad.pdfIn PDF document text
    • https://yodishit.com/uploads/userfiles/file/fimotolaxebunamogubazi.pdfIn PDF document text
    • http://ues-rb.ru/themes/ues-rb.ru/files/jopitugok.pdfIn PDF document text
    • http://shriramashramps.org/userfiles/file/99159394350.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_off0000c635.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC635 17236 bytes
SHA-256: b8e7b0e0524a198e66142bdf95a185b6591f9ec59792b69b1538896fa832b92d
font_01_sfnt_off0000f280.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF280 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A97 11432 bytes
SHA-256: d1207f16b62a746c19a7b23100e281976e658d16cfd8797ce7e45606f5bd5db5