Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d7e249fc47ae4f8…

MALICIOUS

PDF

100.4 KB Created: 2021-09-17 22:12:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 373f78c10ab314524a0ec21067e196bc SHA-1: 13d5416718219610664c2638708ce9a7fb2468bf SHA-256: 7d7e249fc47ae4f87c6d3ac2c03b9910da587295cb28bab0b8707289e2849fba
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS uploads, indicating a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the nature of the embedded URLs and the heuristic firings suggest an attempt to exploit users by directing them to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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://smidgel.ru/uplcv?utm_term=android+app+foreground+event PDF link annotation
    • http://teormech.ru/teormech/usrimg/file/81825205551.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/82769438845.pdfIn PDF document text
    • http://asiancfea.org/userfiles/file/98469340061.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142401a7185d---2450770616.pdfIn PDF document text
    • http://atmaircenter.com/lb/userfiles/files/13859587264.pdfIn PDF document text
    • http://formel1vermietung.de/userfiles/file/53693007079.pdfIn PDF document text
    • http://www.cottagegrad.ru/files/file/77011383772.pdfIn PDF document text
    • https://myagenda.myagenda.cz/pictures/editor/files/41868202094.pdfIn PDF document text
    • https://ltes2.tw-goods.com/UserFiles/files/jezosobomivuj.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/5n921l1t1ceamc27f6m09qel90/mexadofig.pdfIn PDF document text
    • https://fizjolech.pl/userfiles/file/74213165735.pdfIn PDF document text
    • https://paroles-vives.com/ckfinder/userfiles/files/vodunera.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a035e7adc8---kotew.pdfIn PDF document text
    • http://kursverwaltung.fit-n-essen.ch/ckfinder/userfiles/files/77500889832.pdfIn PDF document text
    • http://romengo.com/ckfinder/userfiles/files/20934727892.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/38am1pbg965klq9fpdatjohamt/jodafivukozakeko.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/28780967936.pdfIn PDF document text
    • https://mauspro.net/upload/files/selotud.pdfIn PDF document text
    • http://myepres.com/HotelEstimator/userfiles/file/51618144492.pdfIn PDF document text
    • http://tienphat.vn/imagesflashupload/file/nelekamifog.pdfIn PDF document text
    • http://flyingwedge.com/uploads/assets/file/92417801017.pdfIn PDF document text
    • http://cgpreceptor.com/ckfinder/userfiles/files/71456854219.pdfIn PDF document text
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/xasabotubepizuvudonu.pdfIn PDF document text
    • https://rtquery.reitoken.org/Coaching123/images/files/gazuluwutizosen.pdfIn PDF document text
    • https://g4m3s-4p1-12s1.com/contents/files/jazevopazaxugutatogi.pdfIn PDF document text
    • http://dennehylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/96255346895.pdfIn PDF document text
    • http://zhodnoceni-penez.cz/is/images/FCKeditor/File/zopitanesi.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_off00012574.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12574 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013d8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D8B 10608 bytes
SHA-256: 2c8e819edf4a09fe7368163fa6b493929333aa56d4b24d82f7c71c60a770d8e9
font_02_sfnt_off000155b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155B4 17680 bytes
SHA-256: 8a3914bd1351567c83706f3a3e6be97436cd593fcf08ec9bc058f7f647fb73a7

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