Malicious PDF — malware analysis report

Static analysis result for SHA-256 1592b3505a42c23a…

MALICIOUS

PDF

84.2 KB Created: 2021-07-27 18:46:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1dcc94e8197a17cfcedc83b23d623ee9 SHA-1: 3527692d06317cc8295b2e9853912536de51055e SHA-256: 1592b3505a42c23aac230ff42a6bf9b6f6e00086f260ea4102b15688a44a357a
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://vorne-sitzen.eu/pcms/content/file/rajanujujebidi.pdf In PDF document text
    • http://solamsys.com/userData/board/file/rosobunivawebidinavusag.pdfIn PDF document text
    • http://gtshotel.it/images/file/7651473623.pdfIn PDF document text
    • http://dgjst.com/upfile/file/lufaretux.pdfIn PDF document text
    • http://fst-uinsu.net/userfiles/files/56025281592.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/bcda16490e3296327e08c17fc42b0e56/2480517450.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/bafeluwikovogeso.pdfIn PDF document text
    • http://gingerbreadvillage.org/clients/e/e3/e396b250b60561adcb946853f9f62e29/File/99089403575.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c92cb65abb0---pitisuwa.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d207e064805---parimeduse.pdfIn PDF document text
    • http://lorichphoto.com/pictures/file/pogakis.pdfIn PDF document text
    • https://strechybenesov.cz/content/72074358187.pdfIn PDF document text
    • https://marcuspietrek.de/MARCUS/files/file/fukalojigorojukazidiwiwi.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/96990268282.pdfIn PDF document text
    • http://rana-international.com/userfiles/files/puruxevedamesigoxa.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/s9ktrqa97slbti62pk7v38td9j/serilufab.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/hh512g9q245uabp5o7ko2dh772/97377300935.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/c9daf077ce177761c715074bded52d71/taxupapobireduxiwus.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a71b3ea67ae---rikorasenafubowefo.pdfIn PDF document text
    • https://karpzbeldowa.pl/uploads/userfiles/files/42938097282.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aec3d2703fc---femigadojokuzixorevega.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/5325634cbbc56c49b2ae4d2c52b606e6/91798569926.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/5ao2ht7m63stdiid8qld6763e5/semuf.pdfIn PDF document text
    • http://rheumatology.institute/upload/content/file/76657407882.pdfIn PDF document text
    • http://stainless-faucet.com/uploads/htmlupload/files/lajun.pdfIn PDF document text
    • https://panama4d.com/contents//files/68783190418.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=polk+audio+powered+subwoofer+psw125+manualPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e30c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE30C 11288 bytes
SHA-256: 7c5e70d9de111745c7af428001d9e9c3e717923b000640e0fff03a0149b6ca0c
font_01_sfnt_off0000fd7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD7E 17184 bytes
SHA-256: d342a0b2f7b517b34dce906e604e5fb0ef23eef65059ca81c81bd03213c9ecf1
font_02_sfnt_off00012a7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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