Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c1ca224bb5d592b…

MALICIOUS

PDF

293.9 KB Created: 2021-06-29 08:48:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: a8406432f705ba2d9e12052f05841bc6 SHA-1: b0083ff286fa97b307e52ca601fa55d30e4f510a SHA-256: 1c1ca224bb5d592b9e157d79b466b8bd7241470d4d273e380b6210c002d60b6d
166 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning model as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to compromised CMS upload storage, suggesting an attempt to lure users to malicious content. The primary attack pattern involves redirecting users through a series of links, likely to a phishing page or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9766

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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.
  • 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://hokeypokeychallenge.com/clients/7/77/77ac66e313b6cb4bf602f1678accca72/File/20131051708.pdf In PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/8553ab7f6176d4c9d7602380a7ee5ccd/gowexobonirigomuwewa.pdfIn PDF document text
    • http://rcot.by/pics/files/raxufugajumo.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16081523f54d1c---bopogifeb.pdfIn PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/daxodulizebikev.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c83510e3b---98075328998.pdfIn PDF document text
    • http://cecev.com/stockages/files/gitepefileniburus.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608576a1a78e8---8502414004.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/972bbee55c70a88a666bccc9772a224e/nupelal.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/7a9e78b75c49ea40b8f7f97a1fd4b12c/wizaniwigerobutiw.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be2b0444afd---sabegujesiwetiwabef.pdfIn PDF document text
    • http://csc0731.com/userfiles/file/20210617194502_7vg3ld.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16071ad2beab2e---niserefovolapub.pdfIn PDF document text
    • https://yssnewlessons.org/UserFilesTwo/file/belavipabilarimejogarofek.pdfIn PDF document text
    • http://www.vegagastro.pl/upload/file/47600872190.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/5cp1m7ko6ajvl02m567dtvkmp3/kadavomatumitazode.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a6161dc3225---sezagalaximonuvo.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/a70e6bcff83c0c9d122496a436414ce2/89673066541.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/sqvvig9b728gpk365av01acqhf/42668045218.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/53621366793.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160b2156de54b3---zolejexowar.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160779ae4bee97---xilagibinuxikegodoj.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce77aa071b---siwakal.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/5337581c374062d80ec43b4a28cf387e/80985353121.pdfIn PDF document text
    • http://laweasy.kr/userfiles/file/tevirukokoz.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160c97588eaf60---91042108776.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608b0a4469b6d---38641732195.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=new+york+state+stormwater+design+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_off000424d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x424D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00043ceb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x43CEB 19408 bytes
SHA-256: 406abbbfa77809bff1b69e0306fb48ca94359a0e01194fdedb090516a3711ad0
font_02_sfnt_off00046f92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x46F92 10960 bytes
SHA-256: 5895e9f399df482df59ba3843454ae0e3926c7c4d2cb28d2d7003145e842f6d5