Malicious PDF — malware analysis report

Static analysis result for SHA-256 911b820171fdc0de…

MALICIOUS

PDF

75.9 KB Created: 2021-09-24 19:59:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a69aabf5e0c27fd0fdb9a58709c92a8a SHA-1: d8255a90dffbc8f3b1c0eff41159511c66f8b1f5 SHA-256: 911b820171fdc0de045783a9f818547754fa1a6a99edcd3eac33b1108b8212e0
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document contains a link farm with numerous URLs pointing to potentially compromised or disposable hosting, suggesting an attempt to distribute malicious content or phish users. No scripts were extracted, and the document body was unreadable, but the presence of many external links and the high ML score strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://pretaporter-pegah.com/userfiles/file/safanunosaredadobewas.pdf In PDF document text
    • http://marikitaberbagi.com/userfiles/file/tovuguserulapoguxoziwu.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/308jdbcdo83608hjubjfi1n7vc/fitosuvaxixux.pdfIn PDF document text
    • http://fitviewer.info/files/file/77455755121.pdfIn PDF document text
    • http://hzkontejnery.cz/ckfinder/userfiles/files/80612813482.pdfIn PDF document text
    • http://www.azurwelcomeservices.com/userfiles/file/48419846706.pdfIn PDF document text
    • http://xn--90afqerdlt1f.xn--p1ai/admin/ckfinder/userfiles/files/29075799717.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/611a36df4f5b08a7e466938706d29270/gijetemofuvupufevege.pdfIn PDF document text
    • https://superpackeg.com/userfiles/file/60418664741.pdfIn PDF document text
    • https://ngonluathan.com/images/ckeditor/files/97705679283.pdfIn PDF document text
    • https://stpm-sa.com/userfiles/file/61569785135.pdfIn PDF document text
    • http://qiuyutv.com/userfiles/files/20210919040038.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/f92ad166c89956e17524d0fb6dd5e0c2/tesikodi.pdfIn PDF document text
    • http://edilcfcostruzioni.com/userfiles/files/76761185799.pdfIn PDF document text
    • http://gokea.org/upload/editor/files/31150811904.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/jaxafo.pdfIn PDF document text
    • http://lisaarkinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xidabitowasima.pdfIn PDF document text
    • http://wagnerpc.com/userfiles/files/95706623524.pdfIn PDF document text
    • http://kiszelyugyvediiroda.hu/docs/file/rewesukiderawefamomivi.pdfIn PDF document text
    • https://www.champagne-cornevin.fr/ckfinder/userfiles/files/27862022518.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/8ti2l832ndufih799m8jbjnu05/warasufip.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/gagakap.pdfIn PDF document text
    • http://losmarinoslanzarote.com/marinarubicon/admin/file/5720244965.pdfIn PDF document text
    • http://lube-stc.com/ckfinder/userfiles/files/83965329620.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/9cd86230ae3049b39edc626157ff8fe4/76300977912.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=el+principito+libro+pdfPDF link annotation
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b329.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB329 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB3A 16180 bytes
SHA-256: c0217721a1102ad1f8a8ff5461faadb02f26a3634bfe128d67f68b25b112ee8f
font_02_sfnt_off0000e0e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E4 10276 bytes
SHA-256: 67dd4d5dbd16ae4c1a294bc46b0c7994cb092a19b3a0ba38d4e6d014d60d56f8
font_03_sfnt_off0000f7c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C8 16588 bytes
SHA-256: 1369a0ca9ec9d64808453dfbacfba580df30697b908e3ac500e211ed4551505c

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