Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9c0108956f5434b…

MALICIOUS

PDF

73.5 KB Created: 2021-08-21 14:16:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6bece0ae9b178f70132ca80a35bdb964 SHA-1: 9f7a8ea21637101326e39a8fc0eba939924dbc61 SHA-256: d9c0108956f5434b3b5c669de5b3bf7c70535095c31b114367b5892a8554f7cc
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed for malicious redirection. The ClamAV detection and ML classifier flagging further support its malicious nature. While no scripts were extracted, the structure and URL patterns suggest it's used as a lure to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6419

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://scoopsites.net/userfiles/file/70528933270.pdf In PDF document text
    • https://gymlesgeants.com/upload/editor/file/gilesixakiwebaforutipiku.pdfIn PDF document text
    • https://navliecky.net/userfiles/file/losamarefu.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1610d96a8b51d2---89736695011.pdfIn PDF document text
    • http://i-biohealth.com/files/boxebifatefosolulef.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/0a14698781e86f41e2832ac8dc3abfcf/97973838209.pdfIn PDF document text
    • https://mptradingcompany.com/userfiles/file/10210674470.pdfIn PDF document text
    • https://tw-itemaos.com/ckfinder/userfiles/files/59490199208.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8089b7e9b---57905742294.pdfIn PDF document text
    • https://dudikom.pl/userfiles/file/fakogi.pdfIn PDF document text
    • https://ceral.pl/ceral/pliki/file/woxekolevudasubebi.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/surozoxugaviwibilavejirer.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210525080639173.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca3ada00809---20387296700.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/a2dd0f791a7ada01b82cac7b3f503d8e/sobukerodefol.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16102f80c5666a---lunovuxajewopinugovuniwid.pdfIn PDF document text
    • http://camel-republic.com/media/userfiles/files/31501473682.pdfIn PDF document text
    • http://hiro-seiko.com/upload/files/xugijiwunuragekavunuwisa.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/54144f1b035f7b6abdc47707eb0b1962/5299650508.pdfIn PDF document text
    • https://travellifeafrica.com/ci/userfiles/files/dejobapirudodosusokovuj.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/0268bad552cff108642525e7100f7d13/kezamawabevufuludufa.pdfIn PDF document text
    • http://hoanhaochemical.com/uploads/files/xaresemivisarotunug.pdfIn PDF document text
    • http://bonapartefamilynetwork.com/clients/7/7d/7d081654635712149502d88e72c54c2d/File/wizujekimuj.pdfIn PDF document text
    • https://ckmusicdesign.nl/userfiles/file/98491138594.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/50d9350a892c05d3b34bb0de58b4f8e6/12193653674.pdfIn PDF document text
    • https://n-v-v.dk/userfiles/file/vonunulusilunan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=practice+makes+perfect+complete+spanish+grammar+premium+fourth+editionPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c625.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC625 16404 bytes
SHA-256: 7e5075f98bcbfb430f105c9aa96fb0359352bcfe5e799187bb2392142305548d
font_01_sfnt_off0000f10e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF10E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010925.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10925 11260 bytes
SHA-256: b53e52464d07144700460b57d1f5de1d3faa4cca85dfdc394f18926e061d2572

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