Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad9cddc969b2d5ee…

MALICIOUS

PDF

84.7 KB Created: 2021-09-05 02:53:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a2a51068d23e432c83ba67ad1aa083fb SHA-1: 13cac8b1dc1a7dc8930a0699fae46aaced9ebc41 SHA-256: ad9cddc969b2d5ee0927d58ce4de5ad28ce846b6a8b5fbe0cd7774cebbcb7233
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm to distribute phishing or malware. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. No scripts were extracted from this sample, but the overall structure and URL distribution point towards a phishing or malware delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://oniceh.ru/uplcv?utm_term=numbers+worksheets+for+adults PDF link annotation
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/70e7952582e7acb1afb2b0adbd9e1067/34529873120.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/vavanodisukojazukupilux.pdfIn PDF document text
    • http://fizjoactiv.eu/Upload/file/turaxevosobutagugetatet.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/k2crhqp1hj0b6q79tmbtj8jnl1/25550528686.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f860d277949---xekiririb.pdfIn PDF document text
    • https://dienmayminhchau.vn/uploads/news_file/66064219663.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/2d0uobnsps5i1gpsgurcdf7u83/30928750489.pdfIn PDF document text
    • http://xnkvinatimex.com/uploads/files/tebejewuzagalofikaxat.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081ad22dd0c0---79240313704.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609297593ae72---37881326598.pdfIn PDF document text
    • http://esejsc.com/upload/files/jubotifowomazugasi.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/a1c53820eaa2cab5f6e1586edf8f2aac/28445127957.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160e8ddcc00f27---sitozadiwawutijoruwo.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e5202a35153---faguvuxufumujajepuzafa.pdfIn PDF document text
    • https://ski-valloire.com/ckfinder/userfiles/files/jabobemutofexumiralalefi.pdfIn PDF document text
    • http://saikunghouse.hk/userfiles/75536173343.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/4r4utc9npanp0tl5t6b9kgrqol/28728110821.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160945bd25b1cd---fosofegidanixavafuvuzime.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///mibuludude.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608f7b1e0c6d3---zikaxejokugolewotumovuxe.pdfIn PDF document text
    • http://www.specemc.ru/upload/files/12987936598.pdfIn PDF document text
    • http://emeraldcovepartners.com/_data/images/file/48442670452.pdfIn PDF document text
    • http://ntep2008.com/UserFiles/File/saduj.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/56393404903.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_off0000e4c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fcd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD9 18484 bytes
SHA-256: fe349943f3744d32e38092042a3432844d4576b7f6b61d55843a7e596b373969
font_02_sfnt_off00012c85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C85 10820 bytes
SHA-256: 2d98523d8a7b71cda7ffff662053413d957f22ab7acb8fb9586b433c1a5747e9

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