Malicious PDF — malware analysis report

Static analysis result for SHA-256 e91dd9647004085a…

MALICIOUS

PDF

90.8 KB Created: 2021-09-02 13:51:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d8d5e7eb378bd4a328e531fd191e45f0 SHA-1: d8c9574366b2807b5b062e3bb381bdeda76e0058 SHA-256: e91dd9647004085a918d87a61dab27949fcaab6968724c94da8e019153b901bc
116 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1071.001 Web Protocols

The PDF contains numerous links pointing to potentially compromised websites and disposable hosting, disguised as a service manual. The ML classifier strongly indicates maliciousness, and the presence of multiple external URIs, including one using a raw IP address, suggests an attempt to redirect the user to a malicious payload. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://studiogallerani.it/userfiles/files/6297310882.pdf In PDF document text
    • http://portamarioarchitetto.eu/userfiles/files/bewoxesunubavolewolujomi.pdfIn PDF document text
    • http://au-coeur-du-temps.com/userfiles/file/sekajigifopawotawasewafu.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b83710c54d---wufuzowaju.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/16082ac7653611---37738229813.pdfPDF link annotation
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609457cce1cde---mamidetul.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dec7a58cc0f---vatataxorusijowa.pdfIn PDF document text
    • http://tingyi-bnb.com/CKEdit/upload/files/71385380289.pdfIn PDF document text
    • https://alibabaoman.com/basefile/alibabaomancom/files/36420766990.pdfIn PDF document text
    • http://studiovalentini.eu/userfiles/files/xowapimutepidurolabemij.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/73538575130.pdfIn PDF document text
    • http://mtegl.wsystem.sk/userfiles/files/40370122823.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/130e0812557981eef5e5f3415f0945dd/27689071156.pdfIn PDF document text
    • https://helicopterleasingservices.com/userfiles/files/faboxebo.pdfIn PDF document text
    • http://www.leposeur.fr/site/upload/ckfinder/files/wusafinirum.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c98a02e2b6---86743224852.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/16088f4cfc7893---robeketifomipawosabosiku.pdfIn PDF document text
    • http://angeladaniel.de/uploads/files/68160405258.pdfIn PDF document text
    • http://www.gesas.it/media/mailinglist/file/lafotomoporek.pdfIn PDF document text
    • https://xn--interpeas-r6a.es/upload/files/64103030048.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/9c37042d90c9a4419a2a638f2194cac0/95460149375.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16084aa4f489c8---64518450184.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160766fedf12f3---pekemovudur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=honda+civic+viii+hatchback+service+manualPDF 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_off0000fd23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001153a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1153A 11024 bytes
SHA-256: 02d97d9afb92f6e695371c0ee20ff78dce86ead4add2be762ad8af67e77147b8
font_02_sfnt_off00012ea5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EA5 18420 bytes
SHA-256: 64b554392fafe05770092c6a10d38183aa05e357066bf89a063f71a6ee773f80

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