Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e5b2df528d9df63…

MALICIOUS

PDF

82.1 KB Created: 2021-09-01 23:56:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 71588598f0591d6bd32f4729f9461bd5 SHA-1: 36e05fe193c71556f4c8bba21952e8978e0b66b5 SHA-256: 5e5b2df528d9df637e790ae8c52d445b707678ccc88786d933efe3b8499e59f6
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted from this sample, but the extensive use of external links is the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://garglob.ru/uplcv?utm_term=anne+carson+eros+the+bittersweet+pdf PDF link annotation
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dea81d9e1e---peserekud.pdfIn PDF document text
    • https://birotex.rs/images/files/99455636565.pdfIn PDF document text
    • http://pensionpoint.cz/userfiles/files/27370419725.pdfIn PDF document text
    • http://ceramicaartisticamarsalese.it/userfiles/files/20110340240.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c11d6122385---85158696412.pdfIn PDF document text
    • http://avtrak.ru/ckfinder/userfiles/files/fuditevapeworedar.pdfIn PDF document text
    • https://bestofbucerias.com/upload/file/11371685847.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/lu8ubi2n30hom92thrcg31f8d0/8508144834.pdfIn PDF document text
    • https://tyko.pl/userfiles/file/31573456102.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093e8e850de7---86555574769.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bffc719724---gufezukagigodu.pdfIn PDF document text
    • http://ptaki.info/imgekoprojekty/files/tudodadibegibug.pdfIn PDF document text
    • http://kipia-nn.ru/userfiles/file/85885235244.pdfIn PDF document text
    • http://freeski.hu/freeski/file/34492841421.pdfIn PDF document text
    • https://careersourcechipola.com/files/public/66165885101.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/o64co4cs6bb5sep3qk0c1quj5n/9024949159.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160a92ee7e8e6d---sokedawetepasesefenumepal.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/sagisajurokufa.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/fc59974ffcb923d94039eef622495d1d/fakonozesoba.pdfIn PDF document text
    • http://ceraunavoltapizzeria.it/userfiles/files/xegidufexabiwuxewuwososik.pdfIn PDF document text
    • http://frutapacargentina.com/ckfinder/userfiles/files/73664286736.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6e2869f68---99935145121.pdfIn PDF document text
    • http://hamzalegalservices.com/userfiles/file/11673887685.pdfIn PDF document text
    • https://fotoprint.lv/downloads/file/kifupedaromovip.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_off0000d80b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD80B 10880 bytes
SHA-256: 686a99fdf5b95e8e9a152be482434ba68a5b92837eed868347c8b62de7cc4918
font_01_sfnt_off0000f107.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF107 19520 bytes
SHA-256: 37989177f56a5c27774db8e39fe36f235e25e5b28f4ac61fa5f5f0c414d8493d
font_02_sfnt_off000122f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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