Malicious PDF — malware analysis report

Static analysis result for SHA-256 cff620d3603b25c1…

MALICIOUS

PDF

100.1 KB Created: 2021-06-28 23:07:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 4b63ef61eef8a7cd832da79ac5d70eb4 SHA-1: 25af00440db62830f5da425dfc3d93a4534fc85b SHA-256: cff620d3603b25c1310f3d768fe204c4e25f39b30177eece38618b16c3feb159
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and a high ML classifier score. It functions as a link farm, directing users to numerous external URLs hosted on potentially compromised or disposable domains. The primary intent appears to be directing users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9800

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://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608a38e124344---diladadofuzupugoti.pdf In PDF document text
    • https://kurishupally.org/userfiles/file/22922047355.pdfIn PDF document text
    • http://1984wnhs.com/clients/2/25/250e0aaa51dad033202e6c34d8602b4d/File/67788499368.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/e3bc40036b758c39f0f99fa491cac8f4/pidifopasisefuvitogevok.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/d43f24f7d0d4f7f06193f0ec434357be/45673497755.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/ia59iqeqfnra6jornppccvf0j3/bofajerova.pdfIn PDF document text
    • http://architettosirocco.it/userfiles/files/nujurirafofokisalito.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4a7fc72f71---karoduwipedimizipewesu.pdfIn PDF document text
    • https://samtee.com/admin/images/file/49599492964.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098525bf3c00---76581098730.pdfIn PDF document text
    • http://tizianaiberti.it/userfiles/files/rudidune.pdfIn PDF document text
    • https://espiber.cl/images/uploadedimages/file/vawepakoxumur.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba19f3d17d9---rufigefusogarogagipifike.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/eus1a556ornv4lsfcckhr3f0m0/zuwugazelumosepololonu.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/j55uljubilfm5to7s2c1bdjkv0/ribamejebafewajodive.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/3916bcfee5a2a8d00d455fb6a401790f/34230879339.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/2fce142d996c1fa968e0e3c4eb038981/24482043470.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608137e0902e0---bifanupikejevumokebemori.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/kobikumubojolivile.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/dia8vsrirdv59nng13v9mfom3v/23409308585.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f42f459f27---fulexitupim.pdfIn PDF document text
    • https://nestuby.com/userfiles/file/49702939684.pdfIn PDF document text
    • http://tinnaduraflex.com/uploads/files/94367605062.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef8ac74d24---mukuvezud.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080b5e99a07a---befijomerezag.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a71bcb9bbe3---3007493103.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=conform+tamil+meaningPDF 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_off00012012.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12012 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013824.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13824 19492 bytes
SHA-256: 2dd0f604390a54873dcb938226e0fda5d952877531dbb4742993b400e679c594
font_02_sfnt_off00016b90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B90 10420 bytes
SHA-256: e0239074cf22159f7837026f842b4fe39964ad75c740cd0f010274786387d767

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