Malicious PDF — malware analysis report

Static analysis result for SHA-256 d52063a79346633e…

MALICIOUS

PDF

91.9 KB Created: 2021-07-24 17:23:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 0c32c5940da806142386b3659be69ff0 SHA-1: 6db94633df025c9bfba70c576aa5ac22e5be6bc2 SHA-256: d52063a79346633ec5c9edab898a35d9a8ea4d3f59694c8c2395af7c3a6569c6
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. The document contains a link farm pointing to numerous compromised CMS upload directories and disposable hosting sites, indicating an attempt to redirect users to malicious content. The presence of these links suggests a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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 http://k1a.ru/images/files/file/2476955249.pdf In PDF document text
    • http://redhillplantation.com/clients/1/1a/1a02e1fabf1298af97853074613e4b20/File/43938000120.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/zofinapim.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b24c8642915---nawenovodagizofebi.pdfIn PDF document text
    • http://paynechapelduquesne.org/clients/9/9b/9b910c66cef3ae2d1bb1fd5804160a19/File/21008420848.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160792b94d534b---32527172220.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c78fc3dc384---37475871728.pdfIn PDF document text
    • http://primebrokeragetx.com/ckfinder/userfiles/files/71317693869.pdfIn PDF document text
    • http://finemetal-cn.com/upload/files/wijoporidupikufep.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160beba8c3e25a---93161266831.pdfIn PDF document text
    • http://nuovojob.com/userfiles/files/gijefix.pdfIn PDF document text
    • https://pharmawell.eu/ckfinder/userfiles/files/51147704261.pdfIn PDF document text
    • https://hiperaktivite.info/userfiles/files/gasuparuwisalosukedoguvi.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c565aaccc43---winarixit.pdfIn PDF document text
    • https://nazragame.com/calisma2/files/uploads/80810703653.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607a069e8f7d5---xujofiri.pdfIn PDF document text
    • http://cimkezes.hu/uploads/ckfinder/userfiles/files/9413740607.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c22cfdbe78b---resuxi.pdfIn PDF document text
    • http://proxima-design.cz/files/file/susosavofarigowibidexev.pdfIn PDF document text
    • https://bojovicsirogojno.com//files/fukilif.pdfIn PDF document text
    • https://digireg.es/upload/59226409578.pdfIn PDF document text
    • http://execdentalclinic.com/uploads/ckfinder/userfiles/files/48230277848.pdfIn PDF document text
    • http://clearspace-design.com/CKEdit/upload/files/vikadajejamusogubilena.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=uyirai+tholaithen+athe+unnil+thaano+album+song+mp3+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB1A 16164 bytes
SHA-256: fd494554c7a7a2c4488382a78096c535ff133766c7221992be4f6a58596b2467
font_01_sfnt_off00010091.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10091 11460 bytes
SHA-256: 6c77f2ab63f6d4eda5d102d9047e80296b23e398e3dd401a62414ea8a524acef
font_02_sfnt_off00011b1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001332f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1332F 17920 bytes
SHA-256: 6ac8cb89ac1585f1aca339dbd60bdc6be2d9b51946a724fb21b5705a225c52c9

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