Malicious PDF — malware analysis report

Static analysis result for SHA-256 44ccec78f473ef23…

MALICIOUS

PDF

97.7 KB Created: 2021-10-06 08:08:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 9910caf07a040e24b3b386bac160d800 SHA-1: ff4d2d3c9f82aaa8c72a84c56602ab43019fdaf3 SHA-256: 44ccec78f473ef236761534d0da6f152a03b934a92c318459210680277dad946
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to compromised WordPress upload storage and disposable hosting sites. The presence of numerous external URIs suggests an attempt to redirect users to phishing or malware-hosting pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://pistant.ru/uplcv?utm_term=meaning+of+asymptote+in+math PDF link annotation
    • https://altonika.pro/files/fck/file/vobuwenagisanoletalowijad.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/161410b71231ae---21218899709.pdfIn PDF document text
    • http://jia-longsofa.com/uploadpic/jialong151126/files/202109122233369936.pdfIn PDF document text
    • http://anquocrealty.com/uploads/image/files/59709239950.pdfIn PDF document text
    • https://alkirbilaw.com/userfiles/files/53449421488.pdfIn PDF document text
    • http://kusistoconstruction.com/userfiles/file/13733861469.pdfIn PDF document text
    • http://poliambulatorioargentina.eu/userfiles/files/likabasoz.pdfIn PDF document text
    • http://submission.jpvm.kr/pds/userfiles/files/tuzanafaverinebiz.pdfIn PDF document text
    • https://psystat.net/candyticket/uploads/page_images/files/23449606195.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614615dca0b69---sawizibanan.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16158c28c78c9b---76379759605.pdfIn PDF document text
    • http://pasaru.com/upload/files/6217802707.pdfIn PDF document text
    • http://rayocazar.com/images/elfinder-1.1/files/file/97864925065.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1315ec201---10337202422.pdfIn PDF document text
    • http://decentlogistics.pk/survey/userfiles/files/70605273030.pdfIn PDF document text
    • http://rfinshaat.az/userfiles/file/wufomebali.pdfIn PDF document text
    • http://kammatrans.com/userfiles/files/gixifobezidokavijed.pdfIn PDF document text
    • https://brakos.it/file/15915238122.pdfIn PDF document text
    • http://faw-asia.com/image/upload/files/17321823351.pdfIn PDF document text
    • http://srub-servis.ru/userfiles/file/615369015.pdfIn PDF document text
    • http://www.agenbenangbandung.net/file/bujorokorajamum.pdfIn PDF document text
    • https://www.hkha.com.hk/ckfinder/userfiles/files/4316552681.pdfIn PDF document text
    • http://sro52.ru/uploads/files/85811276263.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_off00010e00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E00 10768 bytes
SHA-256: f886b79cc6cf00183ec5bcee413081f372d1cfb31c02ad0e10a1faf9c17464cb
font_01_sfnt_off000126a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013eb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EB6 22720 bytes
SHA-256: 84c44345c0b939c173d7142c4c91caa27c5ab81c69f3be2896f342e60ce28f3c