Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9f7d2e32f48335e…

MALICIOUS

PDF

86.8 KB Created: 2021-09-05 15:53:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c89aabae23f90c9cb13cfe9eaa76ff8d SHA-1: b43b706533ac964619eaca477cc41d3400cf1fd5 SHA-256: f9f7d2e32f48335e1d6c5ee41599732ada73cca8f3fdf679490407c2e909a7f7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to compromised WordPress sites and other disposable hosting, suggesting it's part of a link farm designed to lure users to malicious content or phishing pages. While no scripts were directly extracted, the PDF structure and embedded URLs strongly indicate a phishing or SEO poisoning attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://coral-travel66.ru/admin/ckfinder/userfiles/files/vokibowan.pdf In PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/ff7828080f68e013ff395567ec9d266a/ruzalazalunirafoped.pdfIn PDF document text
    • https://hashtag.school/userfiles/file/pegan.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608364a206716---nusun.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160858fa790a2d---vawegatutudizepiruwe.pdfIn PDF document text
    • http://orhs86reunion.com/clients/6/67/6744625166a0df26c7abb40948833271/File/37113000072.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/3fab9d2562b2d7ca455ac5be003418bb/jivibukiratexaxipaz.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/dn53fnkua7bra0k8c15fselgl7/34430560471.pdfIn PDF document text
    • https://nayyaralidada.net/alpha/ckfinder/userfiles/files/43365244041.pdfIn PDF document text
    • http://goref.ru/files/file/1914204704.pdfIn PDF document text
    • https://upaspor.com/resimler/files/mugamodit.pdfIn PDF document text
    • http://www.medicellbank.com/userfiles/files/54902998725.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/ptfnjae61vj9jva72d7fpuuru0/wufetinolipefo.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c3cb6f99542---mokamemifowiwutodegebum.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-6-14/20210614162758640152.pdfIn PDF document text
    • https://pacie.vn/web/uploads/files/82875154222.pdfIn PDF document text
    • https://arab-hams.com/Ups/files/41882365834.pdfIn PDF document text
    • https://travelsafeway.com/userfiles/file/29885779860.pdfIn PDF document text
    • http://aisef.org/uploads/userfiles/file/file/xiripegunedufizunofidex.pdfIn PDF document text
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/59007945781.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/161062b4ee662a---63510618602.pdfIn PDF document text
    • http://peetersinstallatietechniek.nl/upload/files/vitusafazegidufumevamuje.pdfIn PDF document text
    • http://garantc.ru/userfiles/file/41267713644.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/vekep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=screenlogic+connect+manualPDF 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_off0000ed55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010567.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10567 18352 bytes
SHA-256: ad9aadaeddeef701dd1c4e01114e9bc4d525437987bd27a5ca264ef451054c8f
font_02_sfnt_off00013526.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13526 10580 bytes
SHA-256: 8c4f16cfca7c8a423dcf3a387735470f158db8fd6c7da755db7d51ed386d11f6

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