Malicious PDF — malware analysis report

Static analysis result for SHA-256 11ff794220b33770…

MALICIOUS

PDF

78.3 KB Created: 2021-09-06 09:33:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: dc9486df52874cdef1d988ff60bf8c9b SHA-1: 00e23a432034167503bf0a7a2be7317b4624f1fd SHA-256: 11ff794220b3377020c57de6cfea5331e1ebe88b065fed3dbfa9f4ca7716a2ec
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a ClamAV detection for 'Pdf.Phishing.Trojan'. It contains numerous embedded URLs, many of which point to compromised CMS upload directories. These URLs likely serve as a link farm to redirect users to phishing sites or download further malicious content. The presence of multiple distinct hosts and the use of 'utm_term' parameters suggest an attempt to obscure the true destination and potentially track user interactions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1efe604a6d7413d2806c624dd20ceab0/fomiburowazo.pdf In PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/54134214857.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/4a706e5a3f56fe5cc53ad288445b3683/79191003933.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ff41177b7---37021471810.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/76191807989.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16081c90fd4c5b---sitix.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/918a27873b3251b5d07a6ca2b16eea9e/lowalavodawexajubetevof.pdfIn PDF document text
    • https://hotnews.md/upload/userfiles/files/gipavonadopatemojerojuwo.pdfIn PDF document text
    • https://hotelexpert.ro/uploads/files/zorabubigutu.pdfIn PDF document text
    • http://enjoyisagenix.com/ckfinder/userfiles/files/zevidejawirugurilugovu.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a320bc55279---63736289423.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/f899803cf81ac42bc4482ec7787c268a/nixaraminewepurofarav.pdfIn PDF document text
    • http://robotsuk.com/luckingbros.co.uk/userfiles/files/55986779483.pdfIn PDF document text
    • https://aristi-trap.com/upload/users/files/26238948900.pdfIn PDF document text
    • https://lanna-flyingclub.com/ckfinder/userfiles/files/xigapukepu.pdfIn PDF document text
    • http://yuemeism.com/uploadfiles/files/farudikowabulolaz.pdfIn PDF document text
    • https://arch.ua/ckfinder/userfiles/files/wenuxeneniwun.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/f54c00611ac87d6c53d80c35c565f9d6/xunufofusowuxop.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/xuderudedimarisa.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/41e7ab574dfa24540e03d76b4c5131e4/57277785639.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=reflexive+pronouns+worksheets+eslPDF 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_off0000cb13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB13 17932 bytes
SHA-256: 65d8f0184088dd55c89b233fc3d19aa118d8014a347bef554f10005b6dcc6aed
font_01_sfnt_off0000f970.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF970 10784 bytes
SHA-256: acb218e9a2a74aaa7f06db8cc1caa20d662e5d1dc0b418bd516e9bee4e19215d
font_02_sfnt_off00011249.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11249 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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