Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b70544137c7b2de…

MALICIOUS

PDF

83.2 KB Created: 2021-07-19 07:52:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ed9c01edeef0759ca90a6cbb8042ff71 SHA-1: f0e4189abd936e0ffe59249aa633fcf5cef15766 SHA-256: 3b70544137c7b2de2229e9def09b5f7dfe5f4fd3d287b8d14eb2fc0655483d9c
96 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised WordPress sites. These URLs are likely used to host and distribute malicious payloads or redirect users to phishing sites. The ML classifier strongly indicated maliciousness, supporting the assessment of a link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • 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://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/a102f26eb03290849bb28b4fa5eb3792/tetazekozakololagomuluf.pdf In PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f257b3efd9---48010957937.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aed351be88c---guzirikivixube.pdfIn PDF document text
    • https://raiporjai.com/piceditor/file/jibuduromafesagoguj.pdfIn PDF document text
    • https://etimes.mn/uploads/files/zegisividomoserupuwo.pdfIn PDF document text
    • http://integrotech.com/zdjecia/file/wepusanetemo.pdfIn PDF document text
    • http://vendingchat.ru/uploads/ckfinder/files/dasoparabijipagef.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093f54022f53---xixobitipiluwexobatu.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/d08e2217a28978240ab47e6fb16bfa46/95746043873.pdfIn PDF document text
    • https://flardochform.se/userfiles/file/76423730407.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/damupapew.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6a28b514a---79688772226.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/6ef851be9756ee81d9a511b2669c5f63/97766442548.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/94alahr20ajeek2e4066eq0hb8/36751386173.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e5c7567b97---lovosesedi.pdfIn PDF document text
    • http://aotwresort.net/ckfinder/userfiles/files/52978294462.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c948dd5663---xakewuge.pdfIn PDF document text
    • http://commune-bourre.com/userfiles/file/77739952265.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a1a295c092c---17594311678.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/negadogi.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/dbdd583eb7481639acfa7bf286c6aa98/xodugepu.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607783092957c---dezamafezaz.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607d05a57b2c8---75530682835.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/76428dc8f4d9338ef08a79b417a35a57/petelu.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/5hi1pu71vlsufpiflnj3ii8vi5/leperefagexipabe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=merge+two+word+documents+into+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_off0000e21e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE21E 10936 bytes
SHA-256: db137eeb2783edde39d96e20e41775e2372fe5269a253ec6c3d0c136e78a4480
font_01_sfnt_off0000fb52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011364.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11364 16920 bytes
SHA-256: a908a604ecdffe2a368ece87166ae81e8157433d982da82ac1e16e81d3b7c3f5

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