Malicious PDF — malware analysis report

Static analysis result for SHA-256 f71ddab893289223…

MALICIOUS

PDF

81.5 KB Created: 2021-09-12 02:55:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 947a9a813846b78665f8f8c49c3e69ad SHA-1: 5091a3e61d83ec6e1dc18d4df5d48ea468507d06 SHA-256: f71ddab8932892233d9c46a45aac1ca012b778ca71519a7982eb0a5067eba271
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains a link farm pointing to multiple domains, some of which are hosted on compromised CMS uploads or disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of embedded URLs and the nature of the link farm indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nnkcreations.com/userfiles/file/48222919071.pdf
    • https://preprodpcb.com/userfiles/files/rujejedapodolimut.pdf
    • https://artcorner-fiberglass.com/userfiles/files/gepubusumuwotifopuw.pdf
    • http://stickers-moins-cher.com/userfiles/stickers-moins-cher.com/file/zuvotado.pdf
    • http://s8radziejowice-paszkow.pl/userfiles/file/kuralor.pdf
    • http://chemicalengineers.ie/images/91640115003.pdf
    • http://www.pattyn360.com/upload/forum/files/batifu.pdf
    • http://runhouchem.com/upload/files/jatik.pdf
    • http://magnumprint.ru/upload/files/53780386296.pdf
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/1uh3508jn12uvpjlhs5oaook6c/lajojasoxofemogema.pdf
    • http://www.polni.si/Images/files/11843496374.pdf
    • http://ylpcl.com/ckfinder/userfiles/files/pibuxisidakejoruwazizeg.pdf
    • https://shinaltd.ru/images/file/pewebefodifita.pdf
    • http://snabsz.ru/ckfinder/userfiles/files/35305084039.pdf
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/161381080b4e54---17016199815.pdf
    • http://zetrade.cz/userfiles/file/56700618001.pdf
    • http://donleroy.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/51144672330.pdf
    • http://oodow.cn/upload/file/210911010937645683s2z4b7w081ci.pdf
    • http://gachmenminhchien.com/media/ftp/file/suwafudezu.pdf
    • http://rasciindia.com/firetech/ckupload/files/41388557548.pdf
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137ed8cc315d---88234025750.pdf
    • https://handinhand-daycare.com/ckfinder/userfiles/files/lekijalokalobom.pdf
    • http://foto-preiss.at/upload_files/files/xubiduzisetiloriv.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=skyline+emulator+apk+download
    • 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_off0000d6d4.bin
f7669f1c905e8af7400b8d6e4ddb3dcf675612603976cb320db592fe7acb0e8e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D4 10852 bytes
font_01_sfnt_off0000efe9.bin
809c02fc764b320b5f1b6bcbb398d5aa0150c8a76dba477b84f094ae6376b587		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE9 18532 bytes
font_02_sfnt_off0001201e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1201E 16792 bytes

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