Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b46a224fe03a639…

MALICIOUS

PDF

82.5 KB Created: 2021-06-28 01:35:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 7fd1f441d4a89c098f7526350c6f5f7a SHA-1: 70e14cf24e87282e50d99ce9ec113e08a9af8644 SHA-256: 1b46a224fe03a63975de7623de0f6a3ea12359c12aa89973698feb84a8d67092
156 Risk Score

Malware Insights

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

The sample is a malicious PDF detected by ClamAV and ML classifiers, indicating a phishing or trojan payload. It contains numerous links to compromised WordPress sites and disposable hosting, likely serving as a link farm to redirect users to malicious websites. The PDF's content, though heavily obfuscated, suggests a lure related to image manipulation, aiming to trick users into visiting these phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9783

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://garglob.ru/uplcv?utm_term=cut+image+from+pdf+online PDF link annotation
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/81667baa73adcfafba00ed22fe8754b8/ratib.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/69601902722.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/zoxoveb.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8567609b6---pivesez.pdfIn PDF document text
    • http://innotack.com/userfiles/files/91447043468.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160780ccc74a4d---5546430195.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/ns0427s4bajtvi08r09emq2c4h/12800762728.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b644f1c5fcf---potejinoxufobixada.pdfIn PDF document text
    • https://condominiobrisasdelnorte.com/userfiles/file/damemubufunovizosolin.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160d5e9b9d6347---25715199408.pdfIn PDF document text
    • http://bscsaoner.in/ckfinder/userfiles/files/58211541078.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160842f16d33f7---gupob.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16097bb04cc694---91331675948.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/v3nm87v8m5a126odva2835ara4/musiv.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/76868773718.pdfIn PDF document text
    • http://x04ydivan.ru/userfiles/file/pomojew.pdfIn PDF document text
    • http://orrizon.ru/images/file/bozapegumusowirikodudero.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/4ra07dhs00jf6lavgeb8ph0e40/80717276481.pdfIn PDF document text
    • https://nmcs.ca/userfiles/files/39173736426.pdfIn PDF document text
    • https://rozgarnetwork.com/ckfinder/userfiles/files/2912153689.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/webijosanowifusijimune.pdfIn PDF document text
    • http://cichanski.com/Upload/file/2420204515.pdfIn PDF document text
    • http://vivo-mebel.ru/upload/file/ralulupixidiboxerilove.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/7a582i3ingg5444lstv8eaa5v5/bubazawexonerajakesaf.pdfIn PDF document text
    • http://colorfulmedia.de/fotki/fotki/file/nujedajikafelasizofenol.pdfIn PDF document text
    • https://autoteam.in/ckfinder/userfiles/files/muwepereridipe.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d22f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD22F 18616 bytes
SHA-256: 1030946ad721614233e132e2a8b3e3580150e117a6be840328bc5830869e61fe
font_01_sfnt_off00010155.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10155 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001196c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1196C 10804 bytes
SHA-256: a91abf7c084a169c2332002f14eab8444e2f9e0581aed198343341af4821176d
font_03_sfnt_off0001320d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1320D 2296 bytes
SHA-256: 7df7fa2e82cc03cc78273e3ae6ee1528e6bad376c331a052362e43ffef5c6963