Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2ec74a67ef17d7e…

MALICIOUS

PDF

79.0 KB Created: 2021-09-10 10:33:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8d57622fcd5c75876cc68ede58ca9577 SHA-1: 18d1120c28999ceda6161f77dceee12b108e2c42 SHA-256: d2ec74a67ef17d7e1d9d4686e9cad520942d9ff6c95e8be7478ac5d9761b6964
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external URIs and link farms pointing to compromised websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://crewmak.ru/uplcv?utm_term=how+do+i+get+my+pending+robux
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a72775eda5---96709288998.pdf
    • http://rafaelokazakov.com/file/71988850277.pdf
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613618584e758---nodawowusafapoxodopofor.pdf
    • https://elitstroycraft.ru/source/file/lavelogurelelomivugifoxon.pdf
    • http://sanalights.com/admin/admin/uploadfiles/file/3388024533.pdf
    • http://dongzzang.com/userfiles/file///5713963704.pdf
    • http://thamcohoaian.com/webroot/img/files/20108556807.pdf
    • https://lanhcongnghiepthinhphat.com/upload/files/wavujusuganelik.pdf
    • http://www.wiz-fac.com/uploadImg/file/22256837906.pdf
    • https://voyageaventurenepal.com/upload/files/lomaxufegelawijogi.pdf
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138ed7b42c05---8490305179.pdf
    • http://gs-metals.com/filespath/files/20210904195026.pdf
    • https://smartstone.ca/userfiles/files/xijilit.pdf
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/5d613e041218fb7e3d5bfcf2471c4a56/sowigepexenutefafu.pdf
    • http://sreema.org/FCKeditor/file/xumijuzeselolisoxamalob.pdf
    • https://chv.vn/userfiles/file/zexajuzakijaki.pdf
    • http://xn--h1aaebajlcgx.xn--p1ai/sadm_files/51453879718.pdf
    • http://kbinteriery.cz/userfiles/file/josezezivufaxudadeg.pdf
    • http://chiesamadremarsala.eu/userfiles/files/19005051264.pdf
    • http://nbc.ua/design/pic/file/pekokemezukubadobiwuwade.pdf
    • http://casavacanzesanvito.eu/userfiles/files/lanijofebodoginoparo.pdf
    • https://majubesar.org/contents/files/gagotibazolowawilixekali.pdf
    • http://lutechmed.com/Images_upload/files/14908883123.pdf
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f98f5c1e5c---56206422880.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cffe.bin
59bdbc0454b6cb072272a05fe2a92c205493ee28b1b1f07f6ce2fc1c35d384b1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCFFE 10892 bytes
font_01_sfnt_off0000e8b7.bin
b44831019c7f841909a86124b327033e74c886aac126086e82af7c8998d0fd42
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B7 17444 bytes
font_02_sfnt_off00011660.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11660 16792 bytes