Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf797c5dd86d57fd…

MALICIOUS

PDF

86.1 KB Created: 2021-09-06 20:58:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8e1cb9780fe3065f98df4f25f7fdbd11 SHA-1: 85ee3b7c5068e9f5dc83ea345a0e73998526166c SHA-256: cf797c5dd86d57fd82bbc7451a5fd1435730443b41fc3d7316414f06b8403d98
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. The embedded JavaScript likely facilitates the redirection or download of further malicious content, contributing to the overall phishing or malware distribution goal.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://laborke.ru/uplcv?utm_term=fifa+world+cup+2018+schedule+ist+time+pdf PDF link annotation
    • http://gancza.pl/userfiles/file/53022067664.pdfIn PDF document text
    • https://www.nevjegykiraly.hu/userfiles/files/97520230916.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16073f27264d2d---poluxapunopefijijixi.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/55328029413.pdfIn PDF document text
    • http://brenna-ski.pl/userfiles/file/93193521774.pdfIn PDF document text
    • http://rheinmotel.com/userfiles/file/lumefuzesasilujo.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/908e967650ceb08215b4b0e2717b2a45/nufekizidemekoxuvo.pdfIn PDF document text
    • http://ifa-astrologie.de/userfiles/file/34388850345.pdfIn PDF document text
    • http://waypl.pl/upload/File/93350748891.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/r1m7kbbu51hn80frc3v11v6ijf/xekifasud.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/27934006154.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/72576934094.pdfIn PDF document text
    • https://falconshipping-uae.com/userfiles/files/fetitesotiwas.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091ed5192006---somitifedaseluliwesik.pdfIn PDF document text
    • http://healthywithhart.com/res/file/53141895575.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/4456106349.pdfIn PDF document text
    • http://koala-al.com/d/files/kiguxabuwegoponof.pdfIn PDF document text
    • https://www.pessin-location.fr/ckfinder/userfiles/files/29773754610.pdfIn PDF document text
    • https://promaxsuspension.com/csmimage/file/10922366381.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/dkhathdm8f9qgtopc2k7ehhsdn/41622387890.pdfIn PDF document text
    • http://technoauto.jp/js/upload/files/tiwemisibosogezaso.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/33050064520.pdfIn PDF document text
    • http://euroambulans.pl/userfiles/file/kelunupemuruz.pdfIn PDF document text
    • https://tonwen.org/userfiles/file/nevigofuwunopejugenawaga.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/i54oj2jn0ua61mfshanr856rl0/towuz.pdfIn PDF document text
    • http://avandcie-automation.com/ckfinder/userfiles/files/surufajizefibolagu.pdfIn PDF document text
    • 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_off0000e7fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001000f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1000F 17948 bytes
SHA-256: 7e24c8332969083e13b9ba4b363a2c23dfaa019246c9213b491e19a91f086710
font_02_sfnt_off00012ec8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EC8 11444 bytes
SHA-256: de27001347c973570c02d1fa700f11113ce1c6bfb0fd160e1569910ae6d4313b

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