Malicious PDF — malware analysis report

Static analysis result for SHA-256 88f4454aa9496484…

MALICIOUS

PDF

93.1 KB Created: 2021-07-04 13:18:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 6647cdcbae20cd1d0d0e9bf5bfd1d996 SHA-1: 974a2f64b7997dc2ae1c6fff26815848bdae7e0f SHA-256: 88f4454aa9496484fdad331ac0172a26d6edc0d2f0b531c502baa5c234aed91d
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, directing users to multiple external URLs, some of which are hosted on compromised WordPress sites or potentially disposable domains. The presence of embedded URIs and the overall structure suggest an attempt to distribute malicious content or phish for information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 https://accesoriosalmayor.com/images/userfiles/file/laregul.pdf In PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606caa334dbb2---garawizigijorobilume.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/23941906664.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d685374944---67290522144.pdfIn PDF document text
    • http://rld-carbon.ru/file/56166487088.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073eca7abdeb---48991595271.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/85b4cae7a36ad3040f8e49417d1a822c/vesawemojagusanafasuwa.pdfIn PDF document text
    • https://ratsimae.ee/media/contents/file/25018609394.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8de7158fb---49356227694.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/7661242171b27bf6097e3bbf7bbca70a/23452440337.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/a3e8ef9026aa9fcbb3035db06ee878ca/27153871421.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/lujizumila.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/6ocqh3ja2kgt3c6skfnt0io3a3/89519862453.pdfIn PDF document text
    • http://stalmont.eu/userfiles/file/gopafuvexawubenam.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b33e95f59---nopoxiwatuw.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/ff6fdf0f5b665ea67115a24a8a4ab208/85215529994.pdfIn PDF document text
    • https://yucekalipmakina.com/tsrm1/img/userfiles/file/mixanugubigekejigol.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/lo8bu13f0gtp36s0gdbcrja7mb/56007363868.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160709d431be6f---75413549556.pdfIn PDF document text
    • https://retta-bg.com/userfiles/2190877687.pdfIn PDF document text
    • https://shellserva.nl/docs/Image/file/vosupo.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/41a56678b90b70637979d7b0800d74da/26757356692.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/kanebedu.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b81bfc816c8---sesaragukogefa.pdfPDF link annotation
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=getting+sick+after+travelingPDF 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_off0001093c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1093C 10588 bytes
SHA-256: 7b0cacf9c6b21017c286b837c0c7058b2c11b40581c138b1439bd7ec647a7382
font_01_sfnt_off00012192.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12192 17504 bytes
SHA-256: 5d6576fcb9207c23c2a9f993889e49b1094d08ef493904e59a9473d356badd16
font_02_sfnt_off00014f48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1