Malicious PDF — malware analysis report

Static analysis result for SHA-256 abb7f21cf0191a89…

MALICIOUS

PDF

75.6 KB Created: 2021-09-12 23:50:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 869e88b24527004813d561fe70c51db3 SHA-1: 909206d5534904b5826e11e47a8c29e03d27cb12 SHA-256: abb7f21cf0191a8983456c960fc2e299b9914edad97268cd6f38b9234aa8667b
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with multiple URLs pointing to potentially compromised or disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of numerous unknown URLs and a specific compromised CMS upload link further supports this phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://shiny-baby.com/fileimage/file/marakikigavefemumuvar.pdf In PDF document text
    • http://baschin-heizung.de/meineBilderAlbertGrundschule/file/raton.pdfIn PDF document text
    • http://jodhpurheritagewalk.com/images/file/86254514153.pdfIn PDF document text
    • http://gsmontaggi.it/userfiles/files/35051157791.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/f6382a0daa69b510551bac3ae2c967e8/26677344926.pdfIn PDF document text
    • https://prawobrzeze.info/userfiles/file/89167589446.pdfIn PDF document text
    • http://hoteldazegliotorino.com/userfiles/files/16598738779.pdfIn PDF document text
    • http://mylodge-naoshima.com/24375607943.pdfIn PDF document text
    • http://air-con.ru/upload/files/kazetovej.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1612fbfa59b379---85604361438.pdfIn PDF document text
    • https://aymexco.eu/ckfinder/userfiles/files/vijoxorugi.pdfIn PDF document text
    • http://ganteltechnology.com/system/userfiles/file/fomadedozamekufebutasajob.pdfIn PDF document text
    • http://rockhousemethod.com/ckfinder/userfiles/files/99452765411.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/xokabelamexorolosibutul.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/1ad970f1530bc4750ce2f7cfa6a6babd/fumununufagonamewuma.pdfIn PDF document text
    • http://kanomax-nsk.ru/images/xijejutukoxole.pdfIn PDF document text
    • http://d-innovation.com/upload/files/35957261906.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/a370b5201922ae6f7b30ea718f27f50c/51901734513.pdfIn PDF document text
    • http://naplesredeals.com/userfiles/files/paganapavesazuramuxur.pdfIn PDF document text
    • http://lindendirect.com/tempimg/file/30591793304.pdfIn PDF document text
    • https://byocamacho.com/ckfinder/userfiles/files/12659718845.pdfIn PDF document text
    • http://hamzalegalservices.com/userfiles/file/35993358585.pdfIn PDF document text
    • https://zifu-tech.com/app/webroot/userfiles/files/zojukom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=adwords+keyword+trackerPDF 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_off0000c5c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5C5 16836 bytes
SHA-256: 10d96ff1b4d37792ba6ef4f5c09682bf09f49c614f8a6be40c1dc338ccdd28e0
font_01_sfnt_off0000f144.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF144 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001095b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1095B 10396 bytes
SHA-256: 49b57c958572b29beaa33656d8b68f0bf5071f9e1733c7f70e3ff7bfadb8da53

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