Malicious PDF — malware analysis report

Static analysis result for SHA-256 7883c0cd0c7c4626…

MALICIOUS

PDF

93.4 KB Created: 2021-09-05 11:17:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e6a51efb16c738b3cc9afc58283b173a SHA-1: 5b72741f18b8497ccedeffb6e9751eb80ae9698d SHA-256: 7883c0cd0c7c4626ceda90d753e6c1894cac8867223dde5de1d64f326a961c93
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple distinct hosts, some of which are compromised WordPress installations. The primary purpose appears to be phishing or redirecting users to malicious content through these numerous links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://s8radziejowice-paszkow.pl/userfiles/file/12639961342.pdf In PDF document text
    • https://usdcp.jp/user_data/userfiles/files/36867780814.pdfIn PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/924e0fd1b306bed75b59c3371a60aa11/70102860384.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/tblk2v3qf6o5f13mnm7lbqcguf/56884917301.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085087871303---71709158354.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160f97d27ed3a8---29340664425.pdfIn PDF document text
    • https://makenie.com/upload/files/luxawuzigunoxabezuv.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd970a3c56---fibalologajaj.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/02b12a230ec8b1037221c3f46ad69dc8/lasevurosekanuzuvofisali.pdfIn PDF document text
    • http://centromedicoveterinarioadda.com/userfiles/files/59669826568.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/a20d2e716b8fb2019a1be9f7f9315693/20860236216.pdfIn PDF document text
    • http://kcemsp.org/upload/editor/file/58987292078.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/690d6cbfc119d878ca49e61baaf210c2/16463040574.pdfIn PDF document text
    • http://logansport1971.com/clients/4/42/424235dfd0fdcd2d3cc2afd1e16bb83e/File/xazemadeboj.pdfIn PDF document text
    • http://www.oneworldkarate.com/fckeditorimages/userfiles/file/mawukexafumaxifikajidami.pdfIn PDF document text
    • http://nhatrangpalace.vn/app/webroot/upload/files/85532298987.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/a20db090d9623e12c0e6684151d72b04/jitemetufilobuxibima.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/94587004569.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071a2fbb0d01---fedabawabag.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed145f1ba9---fasozusudokeferi.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/44924534706.pdfIn PDF document text
    • http://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/9476528742.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/20216277966623.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608fae5515dde---81295720838.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=gest%C3%A3o+de+empresas+princ%C3%ADpios+fundamentais+pdfPDF 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_off0001021d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1021D 19996 bytes
SHA-256: 2073cb1b423102313498949c2e314801619ee0a7166c93e47f14488519b128e2
font_01_sfnt_off00013348.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13348 11200 bytes
SHA-256: 6d52313f17d40bea9beac4aa7828cae0b937f7e81c266229a578307557817548
font_02_sfnt_off00014d19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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