Malicious PDF — malware analysis report

Static analysis result for SHA-256 08157a66dda9d544…

MALICIOUS

PDF

77.7 KB Created: 2021-09-20 03:19:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dd424591a5388c49d679b6843bd328ab SHA-1: bbbbbf5eda429a0a53201d787b82c9072c155bfa SHA-256: 08157a66dda9d5441c88f87f7bdc4b9a732240bc807a265d225d190612e5fdcb
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload directories, suggesting an attempt to host malicious content or redirect users to phishing sites. The presence of multiple unknown URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic further support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135358c20a00---xesuvuzobapesoferem.pdf
    • http://fizjoactiv.eu/Upload/file/dovitalepolutiwubasizute.pdf
    • http://veterinariomauracotti.it/userfiles/files/5345861725.pdf
    • http://miyagi.chi-kara.net/Upload/files/febujujul.pdf
    • https://oreopay58.com/ckfinder/userfiles/files/legozunefok.pdf
    • http://metabolizmusonline.hu/images/upload/file/nixavijimeluvovur.pdf
    • http://neogmbh.de/www/sites/default/files/userfiles/file/39245369425.pdf
    • https://maconlux.lu/userfiles/files/17880076334.pdf
    • https://boyanbolyarski.com/userfiles/file/65335115511.pdf
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/19b7897001e162614f9fbb95c18052b6/sexuvedakopulaso.pdf
    • http://dataction.org/demo/dataction/media/lekofujumufani.pdf
    • http://campingwithconvenience.com/files/files/golonelerufomumevojakir.pdf
    • http://beveragesgs.com/userfiles/file/zukuluriporikafa.pdf
    • http://apcmagon.com/userfiles/2718944214.pdf
    • http://xn--9w3b270a7kf.kr/ckfinder/userfiles/files/73601564805.pdf
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd672e2c60---28037396902.pdf
    • http://interface-referencement.com/userfiles/file/jajoxulokubi.pdf
    • http://lamexmarket.com/uploads/files/57042039840.pdf
    • http://xn--aknmedcal-wpbe.com/uploads/file/nugerokiduwofet.pdf
    • http://ambvetfanini.eu/userfiles/files/nuvezijasuwixivav.pdf
    • http://gamecoast.by/uploads/files/27236867752.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=hay+day+mod+unlimited+money
    • http://abcs.umontreal.ca/upload/files/83161713203.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://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_off0000ccd2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCCD2 16792 bytes
font_01_sfnt_off0000e4e9.bin
74b940c6e32e4f9ec2cefca5ab18f4edc1819849b639ab65e5ef2df4c61c748f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E9 10348 bytes
font_02_sfnt_off0000fc26.bin
70c6cb9ddc1a06816c8d3294c95748ca1e827183219d03e16873fcc1fb219499		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC26 18352 bytes

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