Malicious PDF — malware analysis report

Static analysis result for SHA-256 71a5a1658ba6b951…

MALICIOUS

PDF

92.3 KB Created: 2021-09-18 08:27:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7fd5ef6f923ac0520f3dea6c89529ba4 SHA-1: f1aa7b7ec2c797c7f47c015ff3093b4c283d7091 SHA-256: 71a5a1658ba6b951de16dca342f1048b364abae3c0d1182cc116ecfc2b0f614f
156 Risk Score

Malware Insights

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

The PDF document contains a link farm with numerous URLs, several of which point to compromised WordPress upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and link farm heuristics supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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 http://skonasystems.com/userfiles/file/vanaxadibiz.pdf In PDF document text
    • http://tamtamphat.com/upload/files/tewajuzuxafakareke.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16131b2f16c4a2---xajozupujidov.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/voxiripuforurudekowasogas.pdfIn PDF document text
    • http://acmemask.com/upfiles/editor/files/bitoporirixofe.pdfIn PDF document text
    • http://www.horakgolf.cz/ckfinder/userfiles/files/kamabujazi.pdfIn PDF document text
    • https://tspinstruments.com/cache/fck_files/file/rozopa.pdfIn PDF document text
    • https://www.willmarareachamber.com/ckfinder/userfiles/files/radep.pdfIn PDF document text
    • http://ebrinteractive.com/userfiles/file/96346631070.pdfIn PDF document text
    • http://smwiarus.pl/ckfinder/userfiles/files/9534524907.pdfIn PDF document text
    • http://suamayin.biz/userfiles/file/44408630974.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/31hd8vmjkaic1noe19ccdjdqbh/37186020907.pdfIn PDF document text
    • http://dieterheich.de/images/uploads/file/xuvej.pdfIn PDF document text
    • http://dataprint.ie/uploads/file/90947731413.pdfIn PDF document text
    • https://sassanoproperties.com/FCKeditor/file/674274366.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/5111ad59cb4f80d90fff9e3badc21a7b/nizidubetidodolajuketuxon.pdfIn PDF document text
    • https://www.agcontraincendios.es/ckfinder/userfiles/files/56784851698.pdfIn PDF document text
    • http://tokyosushilohaus.com/uploads/files/97756728321.pdfIn PDF document text
    • https://milosislandrooms.gr/userfiles/file/96916237872.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161355c84273f7---15592998156.pdfIn PDF document text
    • https://hohsingfiber.com/ufiles/files/fonisowegut.pdfIn PDF document text
    • http://netichikawaya.com/userfiles/file/91724504404.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133f95f5db8b---32059880098.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=android+app+for+apple+tvPDF 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_off0000e82c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE82C 16228 bytes
SHA-256: 6de2e4de3e01fd5ed443d1209e1dacf3a9d2e38faa1ffa722a59a0423b67245f
font_01_sfnt_off0000fe02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE02 20720 bytes
SHA-256: a09091571a973c75522d17734661218956c29a41617bd641a4c0bab1e73dae05
font_02_sfnt_off000133b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014bc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BC9 10368 bytes
SHA-256: c30f98ad2396c566e0c927943a47016474e9af36b782035d0461a0587179f3af

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