Malicious PDF — malware analysis report

Static analysis result for SHA-256 d16608dfe88300d3…

MALICIOUS

PDF

79.7 KB Created: 2021-09-16 12:18:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ba5c5a19d475e49eee0404466f7b7ff0 SHA-1: fb284cb8a7267c1049b5c23453acdd31a22f7087 SHA-256: d16608dfe88300d3198f72d228c9ead2ad4be2b211bbcfb0e612b58a8412170a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs that point to compromised CMS upload directories and disposable hosting. These links likely lead to phishing pages or further malware downloads, indicating a malicious intent to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://crewmak.ru/uplcv?utm_term=bhe+hacks+fortnite
    • https://promise-land.com/upload/file/18150470579.pdf
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613f63daae762---56125388778.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0c1b0f9c87c403089f1a5d1c4895741c/jozulov.pdf
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/ff7c2bdb67f6083e7625055a44aba77b/54647614835.pdf
    • https://highfieldhousehotel.net/nbloom/fckuploads/file/todijawopinar.pdf
    • http://artikos.pl/userfiles/file/rapefapinibunuzijigasu.pdf
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/2c8601404ff08589e5cc424168598641/64776952808.pdf
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/3f2ad726584edf4dc8877c58c7c7dec8/tijamadasumomedafox.pdf
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc995657c4---melajixaxemaviti.pdf
    • http://reckdance.pl/userfiles/file/27102738865.pdf
    • http://nb-magnet.com/upload/files/mulilofupomaz.pdf
    • http://zamel2.pl/userfiles/file/vitokumisenuzosakewa.pdf
    • https://etest.vn/app/webroot/uploads/files/dawesodijovuluroranati.pdf
    • http://daithanhnam.com/upload/files/87815906469.pdf
    • https://nmcs.ca/userfiles/files/99954968785.pdf
    • http://aucoindeshalles.com/menu/file/55763079460.pdf
    • http://phonphangschool.com/upload/files/1559094802.pdf
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16136edefe3b3b---81482597288.pdf
    • http://pensionpoint.cz/userfiles/files/20723329544.pdf
    • http://hyundainhapkhau.net/upload/files/fodokirilibipit.pdf
    • https://mobspace.xyz/web/img/podborky/files/97430878393.pdf
    • http://cozycornerexpress.com/uploads/files/58821889425.pdf
    • https://maisonforville.be/documents/file/27253528673.pdf
    • http://dentalclinicbangalore.com/uploads/77868125169.pdf
    • 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_off0000d07b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD07B 16792 bytes
font_01_sfnt_off0000e88d.bin
5f4edfb76c8c98ed0e199fad9510434e6fd6309c3d0bce97095f01e47b4dbb45
pdf-font-stream PDF embedded font (sfnt) at offset 0xE88D 18016 bytes
font_02_sfnt_off000117b2.bin
2bc7d247cff0858e7c5f7881d024306f0ae300942067e391a47a9eaa4b4916ff
pdf-font-stream PDF embedded font (sfnt) at offset 0x117B2 10532 bytes