Malicious PDF — malware analysis report

Static analysis result for SHA-256 0820dfc0047006db…

MALICIOUS

PDF

96.3 KB Created: 2021-06-30 04:22:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 624c83eacbc7a6a1723959c50857fe69 SHA-1: 1087bad014bd53e1aa9ec197453b9ba0dbe6d632 SHA-256: 0820dfc0047006db996b75d54b26209bc257b2817a93dcf47a0c7f14bd201494
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of external URIs, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc192252431---87540486751.pdf In PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/nimaki.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/45768627803.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a942c6432ec---bafed.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088f9131e377---mazelajuvobis.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/suzetexomowemarub.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/f0fa88cc8a47472bea1bf64ac76011e0/84830796168.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/qug7pap34uc2h3jvit1511b3sv/zubinivub.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a842678d902---52896397976.pdfIn PDF document text
    • http://fittbike.hu/files/file/31358812478.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/2ecbcaa510be19abb844d86ce907f192/18321303365.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/161645026899.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210513/file/gamosigibu.pdfIn PDF document text
    • http://iglozawiercie.pl/zdjecia/file/giwurovodikosiro.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa92655c77e---kawewumewel.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160aa251f89043---89114523178.pdfIn PDF document text
    • http://ceskylakros.cz/userfiles/file/gaduxan.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bcb9dde152c---fepumogevafutusobubajame.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///40283904433.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/71359924710.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ab9d6442d29---jagogutisajeru.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/ko62j1ik15da9cvhahqr2jm6ov/lapovagixojusizovi.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/39e2745b347f2212146026d35e6dbd5b/mezizawezunatipim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=red+river+gorge+trail+map+pdfPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011900.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11900 16452 bytes
SHA-256: e7a80fad573a20b8a96a1f623b1e2428d79b327b64da85995af694badefa655d
font_01_sfnt_off000143bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143BD 10680 bytes
SHA-256: 007d9a74e7143771bf29f9091da8634c12d601809df7f6ce36bfac86ffed6e8c
font_02_sfnt_off00015c0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1