Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f4b287fb1de6de0…

MALICIOUS

PDF

75.4 KB Created: 2021-09-16 21:59:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 93d2ced1c0a9cf6d4d37ad329b9c7393 SHA-1: 3310cd7339d49e692a1c633e65e85714af9c0a79 SHA-256: 2f4b287fb1de6de0a71066a867e567ec8f79a5ac373493f33ed16360a512f99e
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to compromised CMS upload directories, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the structure and URL patterns are consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://pantipplaza.com/userfiles/file/68555558457.pdf
    • http://www.farmaciavictoriayjmleon.com/userfiles/files/tigumizumebirogivezukow.pdf
    • http://quanhoangtsi.com/upload/quangtri/files/50703828463.pdf
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f8c53e7ae4---nurukometowajux.pdf
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff0f70c3bf---52583206655.pdf
    • http://krakowska98.com/zdjecia/fck/file/bezuwij.pdf
    • http://trunglam.vn/uploads/userfiles/file/sebubaj.pdf
    • http://jd6618.com/jd6618/file/2021-9/file/LwpCms2021_09_05_06_38_40_2802.pdf
    • http://shipsupply.ru/userfiles/files/jigamokojikovajixofomelu.pdf
    • http://studiolorenzino.eu/userfiles/files/tolapuzosazowopitix.pdf
    • http://geostudio.eu/userfiles/files/zagadijazijilolibis.pdf
    • http://biolabsrl.org/userfiles/files/17638364382.pdf
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16141c6765a5d7---9626127035.pdf
    • https://nayyaralidada.net/alpha/ckfinder/userfiles/files/xonux.pdf
    • http://hk-bbc.com/upload/file/36414230320.pdf
    • http://dlabiura.kbo.pl/ckfinder/userfiles/files/76315206305.pdf
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/31hd8vmjkaic1noe19ccdjdqbh/37186020907.pdf
    • http://alconsprom.ru/ckfinder/userfiles/files/28401623160.pdf
    • http://nowyhotelik.pl/userfiles/file/mulojiro.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613724e1dc75f---wazolijilegogup.pdf
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/161425405e10b8---fobaruxurefegolurubofepi.pdf
    • http://gzmzwl.com/Uploadfiles/files/gafopanomakawezixut.pdf
    • http://alde-pace.org/ckfinder/userfiles/files/36087977701.pdf
    • https://paymentor.nl/uploads/file/selibiwusesuvukifuwilo.pdf
    • http://www.jasfec.com/imgs/uploads/vujuver.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=android+11+colors
    • 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_off0000c67e.bin
7068980762ef54d76bf5056e86cb547fd86991ebcfe422e7a0d16e8d314d7d8e
pdf-font-stream PDF embedded font (sfnt) at offset 0xC67E 10004 bytes
font_01_sfnt_off0000dcc1.bin
38fc7e1dadc927ac47d0321d660567c139f495369b31ebca971dbfc2b979ff90
pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC1 16688 bytes
font_02_sfnt_off00010816.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10816 16792 bytes