Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d33c534c3a632df…

MALICIOUS

PDF

73.6 KB Created: 2021-09-13 20:16:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7eed17101f321575f761c7cc0552396c SHA-1: d5376001741608d43ecbba4ddfa3f4b102a3b120 SHA-256: 5d33c534c3a632df2182c9488bb0eb4ac45c43ce59f087c569854f8247f0dcc2
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous embedded URLs that point to various domains, some of which are hosted on compromised CMS upload storage. The primary purpose appears to be directing users to external, potentially malicious content.

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://eiffelflowersquesnel.com/userfiles/file/93273094654.pdf
    • https://nic-irq.com/userfiles/files/11067358407.pdf
    • http://shlawllc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/23307533385.pdf
    • http://zit-tech.com/userfiles/files/bonomolosajakumawoku.pdf
    • http://lifeline-sports.com/files/file/25904097480.pdf
    • http://kerrya.com/ckfinder/userfiles/files/3794702628.pdf
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/7e20f721842e1c8c10104d555e686d77/10975824022.pdf
    • https://makojudo.pl/zdjecia/fck/file/farokeboguw.pdf
    • http://ky-auto.com/uploadfile/files/8419897433.pdf
    • http://abogadosaguilar.com/ckfinder/userfiles/files/gikaxagapifevudim.pdf
    • https://jvlegacyhomerepairsmd.com/nbloom/fckuploads/file/63241454560.pdf
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613589067b0fb---tiwaninenabu.pdf
    • http://elosc.com/upFile/file///ITX202109041836587003.pdf
    • http://gediklimakinahidrolik.com/resimler/files/26770261279.pdf
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/92732667573.pdf
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1613eab5e461f6---9135113182.pdf
    • http://heizler.hu/files/file/34754119525.pdf
    • https://newsale.linyn.mobi/upload/ckeditor/pages/files/3921968167.pdf
    • http://sromedical.com/file_media/file_image/file/vetazefut.pdf
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16138320f819dd---73448259037.pdf
    • http://conditum.nl/userfiles/file/senumopud.pdf
    • https://riwg.in/userfiles/file/33581075772.pdf
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/fec8161662cade03217a72da115e3724/77129335326.pdf
    • https://franciscovalles.comtraining.cl/userfiles/files/masagarukuninimuvide.pdf
    • http://arcstema.com/userfiles/files/fatatar.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=rog+live+wallpaper
    • 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_off0000bd3e.bin
f6fbaf0426ae400646d07e123a4025b86b4afeca5388f733dff8cdd9f0b765a9
pdf-font-stream PDF embedded font (sfnt) at offset 0xBD3E 10252 bytes
font_01_sfnt_off0000d469.bin
e6bd8ca4714499ad06518b358e3d236f615678c23c00d9c356e7e63b2e7aee04
pdf-font-stream PDF embedded font (sfnt) at offset 0xD469 17228 bytes
font_02_sfnt_off00010124.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10124 16792 bytes