Malicious PDF — malware analysis report

Static analysis result for SHA-256 07e825acfc9c84ca…

MALICIOUS

PDF

86.7 KB Created: 2021-09-14 04:22:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 28b70ab92c11d1e1a92423904eb8176a SHA-1: d7f65c644703009f6f05bfeaf18d87c3b4e076c3 SHA-256: 07e825acfc9c84cac63302f86b0c12c51e63be59c6418e12f5f693a48f394b93
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the nature of the link farm suggests it is likely used to distribute further malicious content or for SEO spam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://infrive.ru/uplcv?utm_term=film+online+fast+and+furious+4
    • http://medical-1669.com/userfiles/files/65008241026.pdf
    • https://stpm-sa.com/userfiles/file/sibami.pdf
    • http://studioscoponi.eu/userfiles/files/50509299985.pdf
    • http://cosmoscm.com/contents/files/texulibibobet.pdf
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/2tku6ulmmfq7tdi20tv98cntif/tixekidun.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/rn7vce5k9crhkcdd16m5nbpbm7/95922352873.pdf
    • http://theonejsc.com/userfiles/file/35432523477.pdf
    • https://onecre.com/images/content/files/sapuvotujelajudedunezupim.pdf
    • http://consulcongress.it/uploads/assets/file/22666372668.pdf
    • http://motolargo.pl/userfiles/file/nenemudezusij.pdf
    • http://pasted-radio.de/web/files/1847949483.pdf
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/86519aa2912d075e272c619806bda011/14375249710.pdf
    • https://lanhcongnghiepthinhphat.com/upload/files/44661183286.pdf
    • https://sakkestadbil.no/userfiles/file/86914497827.pdf
    • https://hurghadalife.net/userfiles/files/neguzudi.pdf
    • http://tubemakingmachine.com/uploadfile/files/vukunapudalutunemu.pdf
    • http://tuanayapim.com/rsm/files/nogalawijulepan.pdf
    • https://acrgruppe.de/userfiles/file/zunibixiwovakiripoxudi.pdf
    • http://herve-coiffure.ci/files/lokiw.pdf
    • https://careerroots.net/ckfinder/userfiles/files/pazozusajuxomifuna.pdf
    • http://uteambio.com/upload/files/dokajomofutatekalefesuna.pdf
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/livoregosewowokumopuf.pdf
    • http://polskienarty.pl/data/aktualnosci_imgs/file/65274129685.pdf
    • https://www.truckersplantparts.co.uk/ckfinder/userfiles/files/34257527107.pdf
    • http://phupmirpol.pl/userfiles/file/kodijesovi.pdf
    • http://xn--b1agjlwjc3g.xn--p1ai/ckfinder/userfiles/files/fekoxitavebutajujomok.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eea9.bin
f30a4f4ce5713bce4899eef549112d6bd2f6274e5384e69e5eda68756ee507cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA9 17788 bytes
font_01_sfnt_off00011c42.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C42 16792 bytes
font_02_sfnt_off00013459.bin
30fda3a7ff9817b2564a4557114e96d2b9e962259a6c578c23ef51017d278077		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13459 10668 bytes

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