Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c45700357093559…

MALICIOUS

PDF

72.9 KB Created: 2021-09-27 11:18:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 14dbae52d5984773f0d67a0bf68b6ccf SHA-1: d7820b17fc988f46e76c4cfe3884f163421c3bab SHA-256: 2c457003570935591c7261d00e29913fa09f820bdd72a5d844a41a90fddfe1c8
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URIs, several of which point to potentially compromised websites or IP addresses, as indicated by heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM'. The ClamAV detection and ML classifier also flag this PDF as malicious, suggesting it's designed to lure users to malicious content or download further payloads. The presence of multiple links and the nature of the heuristics strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 http://tasarimak.com/ckfinder/userfiles/files/86246320218.pdf
    • https://noelex22.org/userfiles/file/darujogelogewixatop.pdf
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16143c94839b32---bubopusaludoras.pdf
    • https://lescourailleurs.com/upload/editor/file/voraperorifalorotokipos.pdf
    • https://curtain.jinware.com/upload/files/61043095031.pdf
    • http://klick-tipp.info/ckfinder/userfiles/publics/files/64124450877.pdf
    • http://hardiebase.com/uploads/assets/filefile/66664871505.pdf
    • http://otevrel.eu/ckfinder/userfiles/files/puwemorikoloz.pdf
    • http://rigdrilling.org/userfiles/file/zejetonowosinokafuju.pdf
    • http://140.121.161.111/ckfinder/userfiles/files/getuzurefotubori.pdf
    • http://uniondrygoods.com/fckeditor/userfiles/file/vuxokofekilirulozamuletol.pdf
    • https://cmottaviproductive.it/uploads/file/17235286402.pdf
    • http://gyndoktors.de/ckfinder/userfiles/files/kizufemubo.pdf
    • https://herfection.herfection.tw/upload/ckfinder_temp/files/20210914130004.pdf
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161420ecc22b43---96032666008.pdf
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/56896710378.pdf
    • http://zeguvietnam.com/uploads/ckfinder/files/35670806772.pdf
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/161380812aa627---nitup.pdf
    • http://studioesflores.pl/obrazy/file/zazuwadajixozesapemob.pdf
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/mfbsa8p97gekjdtu9glligohaj/3731151609.pdf
    • http://yourmoneyyourbank.com/uploads/File/67017086212.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=case+battle+mod+apk+unlimited+money
    • 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_off0000b200.bin
2cb013efec0ddf85d53c040b6ddcf8e13780799bdf964deefbbc7d74359b404e
pdf-font-stream PDF embedded font (sfnt) at offset 0xB200 10932 bytes
font_01_sfnt_off0000cb24.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCB24 16792 bytes
font_02_sfnt_off0000e336.bin
e8c03f53a5aa9d94717c024bdf855d127e17729bb10ca0e60b88e4348736f3ab
pdf-font-stream PDF embedded font (sfnt) at offset 0xE336 18980 bytes