Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b8400161d06f9ce…

MALICIOUS

PDF

87.5 KB Created: 2021-09-04 08:28:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 16a380bddd5ef3e4179c7c7878721cb2 SHA-1: 1f3d27c709d96a8badbed08c4266a03a528b90d3 SHA-256: 7b8400161d06f9ce1e057aeda6a06f3ac699de621b09991dac153d1bb60b5ecf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites, likely intended to lure users into downloading further malware or submitting sensitive information. The presence of multiple links on disposable hosting and compromised CMS upload storage reinforces its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/0ph2ouaf0f6o2mrrq5ce714jt8/53432058144.pdf In PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/8vb7l7rmjn620qbrr2033da541/tabizefowirulazozivuruz.pdfIn PDF document text
    • http://midel.me/userfiles/file/48693124733.pdfIn PDF document text
    • http://theclubburger.com/uploads/files/42145869733.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/5aa62b8feac65cbc4207f6851bc826c6/322236350.pdfIn PDF document text
    • http://trips-in.com/ckupload/files/zeliziwokijojafe.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/69810820793.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b7cbb070afb---fowegowelesopafeleb.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/a0d34d033db02ad83856bb85bedde721/guzud.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/8842f13d488927160875e73003364176/51988801321.pdfIn PDF document text
    • http://circuitvietnamcambodge.com/hinhanh/file/vuwifidigubimufo.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609e4a17e974f---ladarukununowo.pdfIn PDF document text
    • http://tugrabilgisayar.net/resimler/files/mavogukikobomipixez.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16075855c1490e---tefafifukijepogudarokim.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/92ce100ddac621c4723aef13d55e1249/nituwekij.pdfIn PDF document text
    • https://progin.ch/ckfinder/userfiles/files/40332432930.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/1608cbd2a34014---9970675988.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/d0d7bf614278be53eea36746f3503276/lorefowekereduzuwisif.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/f6851b18dc007953a11b7344b17c6060/13765443676.pdfIn PDF document text
    • http://starlightcelebre.org/clients/4/43/43e9139217482d7666ce300faf566241/File/timusebu.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/69b4a15b0fd45f6749e2c6f2d0cce763/71201992285.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/r2cev4mv3gvn3tu9qldn6gmie5/menitorilotor.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/48166568174.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609690232821a---bagadexoguziju.pdfIn PDF document text
    • http://mesterek.net/tmp/92740173763.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/e25462fce565ea2a6f849b64c9142aa6/jojasorav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=ecology+concepts+and+applications+pdf+free+downloadPDF 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_off0000ef25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF25 18180 bytes
SHA-256: 1030f6147c67d57f976495aaa509d023f181d713b2066bafd82e7a715c5705c7
font_01_sfnt_off00011e3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E3D 10976 bytes
SHA-256: a91b133a3f67d794ca8145ebb875367dfbe15238c1425aa072e703d22f786c7b
font_02_sfnt_off000137bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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