Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a79d679e9339dde…

MALICIOUS

PDF

86.5 KB Created: 2021-07-02 12:51:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 5185e4fb501dffeed4b15e50627d83ae SHA-1: 8df00dbde05f17a5c0d26eb5d093f1885aa88988 SHA-256: 3a79d679e9339dde81a9feb1896d1c739163180d2c705c1592be8955adb87cfc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. While no scripts were directly extracted, the structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b998f291e9d---86140215351.pdf In PDF document text
    • http://raylutickenterprises.com/userfiles/files/23095809619.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b33c03f2a13---lopalobotor.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bd645dcf285---gimis.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c48c1d65e31---99920396218.pdfIn PDF document text
    • https://churchboys.org/userfiles/files/1194579681.pdfIn PDF document text
    • http://americanpetrochemicals.com/customers/CMS-IMAGES/file/84526211005.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/cd1967de5da56d8aa8f00988de9e7170/madamevenefoguditaxog.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/1d4d1331bf13659c2da0dc00cad5c904/zibisex.pdfIn PDF document text
    • https://33mobility.net/uploads/files/30704866703.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/vilifejaluvo.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdf2e0bef0e---89177503586.pdfIn PDF document text
    • https://feniks9.ru/ckfinder/userfiles/files/nebomozonif.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/58929339179.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/dobome.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/4u35d4i1228cg23rdduo3bmnlp/zuvedabisib.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/59408994c3c5bc92ba2fe2f83d5ab26e/vefak.pdfIn PDF document text
    • http://utuin.net/files/fckeditor/file/28091206.pdfIn PDF document text
    • https://lesura.net/userfiles/file/98086025366.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/94494338893.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/13576f94d20d9f4af9d1afff849ee6b8/15980074224.pdfIn PDF document text
    • http://szalkasszorutacskok.hu/app/webroot/files/content/files/38141564071.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b11e59cbbb5---15708176432.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/kijuwujejasad.pdfIn PDF document text
    • https://bistakalikotenetwork.com/userfiles/file/45370994033.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=mary+costello+the+river+capturePDF 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_off0000ef35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF35 10640 bytes
SHA-256: da638a8f748bbf6b4cc133457435aafcab657cf6741aa4e126c0ea79606d4cc3
font_01_sfnt_off000107c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C5 17116 bytes
SHA-256: e4a0b1995dceefa686735bb16a02fc21c6c5caec11d5e2f957abc7472ff3ff2c
font_02_sfnt_off00013492.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13492 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1