Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b9c3a9e7c23ff9c…

MALICIOUS

PDF

69.0 KB Created: 2021-09-04 00:10:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 692762861136abc50f67cac4306623ea SHA-1: ab96af387de4733fb48016bde47280d82ba42b58 SHA-256: 7b9c3a9e7c23ff9c97db23e067de7b964b9fe33229f83e9229bac98039caa98a
156 Risk Score

Malware Insights

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

The file was identified as malicious by a ML classifier and ClamAV, flagging it as a phishing trojan. It contains numerous embedded URLs that form a link farm, directing users to potentially compromised websites. The primary purpose appears to be redirecting users to phishing or malicious content, as indicated by the heuristic firings related to link farms and compromised CMS uploads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://ketchas.ru/uplcv?utm_term=greater+than+less+than+equal+to+printable+worksheets PDF link annotation
    • https://www.moxiclear.com.au/application/third_party/ckfinder/userfiles/files/35757561403.pdfIn PDF document text
    • https://www.marjojaspers.nl/ckfinder/userfiles/files/fosurafij.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/38378889763.pdfIn PDF document text
    • http://color-gateway.com/userfiles/file/vibivozizosigifowuk.pdfIn PDF document text
    • http://quincy.pl/ckfinder/userfiles/files/lojinekalul.pdfIn PDF document text
    • http://praguetransfer.com/files/file/50857822111.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/22c782c531ab7d4e6e26bc84f4e96de7/tosipadinerojolebapararal.pdfIn PDF document text
    • http://sushi-belovo.ru/files/25249291617.pdfIn PDF document text
    • https://dichvuketoanvn.org/uploads/files/39878108366.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/vavekoxodetorotejuri.pdfIn PDF document text
    • https://pasifikendustriyel.com/userfiles/file/folebujegodaniwire.pdfIn PDF document text
    • http://gshosnab.ru/userfiles/file/31871269268.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a59a2fe9b5c---83725908972.pdfIn PDF document text
    • http://takeacode.eu/user/d41d8cd98f00b204e9800998ecf8427e/file/64364426208.pdfIn PDF document text
    • http://bennyhigh73.com/clients/3/33/33ce00c6a031cf3b17a3dcf69aaa7594/File/49933748617.pdfIn PDF document text
    • http://ouhkpthaa.org/userfiles/87405524953.pdfIn PDF document text
    • http://niszczeniewaw.pl/userfiles/file/kegumewifunikubimigezoja.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/11559825308.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/ceeuhb7a8l477kfgfjcfu5i0e6/23661046528.pdfIn PDF document text
    • http://kutyasturak.hu/images/files/walevobojunenakibubazeb.pdfIn PDF document text
    • http://launensia.cz/ckfinder/userfiles/files/lovaxuzelowetawegatu.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/cfbec5bb0be3a8abdb921031531057d1/delokotomazikoguxanu.pdfIn PDF document text
    • http://eltprof.ru/userfiles/file/lirafufarovesinavigep.pdfIn PDF document text
    • http://xn----7sbbgprpk7biiq.xn--p1ai/admin/ckfinder/userfiles/files/4612048579.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_off0000b055.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB055 14648 bytes
SHA-256: ebdcc57bd9c8fa38ebfcb41b6faf7523a386a20f22d4c6d2dc52d0e8533f92f9
font_01_sfnt_off0000d48f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD48F 10952 bytes
SHA-256: 2541af3fc2b85bf59489151bcbc4ae022abf1cf90e2e99dcd8f263ed5a3e4429
font_02_sfnt_off0000edc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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