Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d7cfcf5a0945a83…

MALICIOUS

PDF

85.8 KB Created: 2021-07-03 21:53:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1f7e2f2f1c299cc5b7018f8a9ce63c65 SHA-1: b6cf32308c22f079250f1fbd5c335c4b4c288de5 SHA-256: 4d7cfcf5a0945a83a261baf8679507c3efb17a3723aba395cca64101ad6e7d8f
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites that appear to be compromised WordPress installations, serving as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure itself is designed to lure users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://wastran.ru/uplcv?utm_term=the+east+of+eden PDF link annotation
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/260a4f95b6b9af3fd936c4883fc1e40d/gisuw.pdfIn PDF document text
    • http://peneleos.pl/userfiles/file/76750291926.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/a71a6d3873e0ef1789d3952182c7d5c8/kegenemisofir.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c0bc44c924---tukitosatokejodu.pdfIn PDF document text
    • https://gerastar.com/userfiles/file/majimotidirojawaz.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee74ce572d---maxakenonogelekujuvar.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/16084495fd7763---lumigitibotexagubu.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/gap9sqrek810pe2qg688tg657h/95089108603.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a13362d21c5---zobopiwojatu.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/b2um1s43askc0s0cf19fqj9r3e/1348360043.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/1c4d2b1e52899d58214d9dfed475bd62/72841030225.pdfIn PDF document text
    • https://csp-pub.com/stockages/files/kenukigatitudosewasaribi.pdfIn PDF document text
    • http://bio86.fr/fichiers/16471245224.pdfIn PDF document text
    • https://delaneyllc.com/ckfinder/userfiles/files/89274679692.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/d053db9fb14471fd9d66b7331681801b/tumafirawukapiwebebusodug.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075ae9a1f973---wepagugitolunij.pdfIn PDF document text
    • http://girisimcilikproje.com/resimler/files/77217117166.pdfIn PDF document text
    • https://baptistfriends.org/media/59298864826.pdfIn PDF document text
    • http://nowator-zpu.pl/userfiles/file/28564001227.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/f0l9hsfqgqj1di9tamo0iuje88/jinifevebowivum.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/94041182092.pdfIn PDF document text
    • http://simonide.org/userfiles/file/gurerogomujekopojojulekud.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607b73767d903---fipumogesaz.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160869201d5ee6---ludisaragepuge.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_off0000ee1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE1F 10176 bytes
SHA-256: 46540360f38ac3b2a6c3b1afab58038907e0b8a6692d22cbeccc5b7e1923eb84
font_01_sfnt_off000104e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011cf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CF6 17368 bytes
SHA-256: 9ac253d8d85066bef01d9b47e2593784cff08a6ccb6e7262bb6549a0d94b8ce5

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