Malicious PDF — malware analysis report

Static analysis result for SHA-256 af978905c71f8b6c…

MALICIOUS

PDF

84.1 KB Created: 2021-09-04 20:55:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a1e9976d3520f54ff476f2557c0d3659 SHA-1: 9ce4b9bf3cb6bb86bafaacc7d500e53f4de0d2c5 SHA-256: af978905c71f8b6cff591648f17a5bcdc665952fb483d93674fe5539888d427c
176 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of multiple external URIs and IP literal links further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16083ad4069b1f---84019093659.pdf In PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/944dc79c5117794bb49b2a813addfa51/pikulew.pdfIn PDF document text
    • https://medius.sk/userfiles/file/zagozubixemed.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1609cde04b8723---10934668646.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/2gf6c1icf3ibvso2io2o5fl661/lobodotoxewirekel.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc1ab183320---75627763856.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///69705535966.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/hs30vbk899tjrhakg0qcbecb2u/34593812484.pdfIn PDF document text
    • https://duvarkagidierzincan.com/userfiles/file/44390624120.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3afd60238---7377205069.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/bd1712198116e3d0f550a5e5948ae47b/larodupibawo.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd65023621---faranotekote.pdfIn PDF document text
    • https://laughteronlineuniversity.com/images/upload/files/28930328073.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ebd2bba7ac---89411300756.pdfIn PDF document text
    • https://stvorki.ru/files/file/rodonuzogogofimefotone.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/10299550245.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/kp06a7hhqmu1b64hhjfqgvqpe6/42389159699.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160714f90c1272---nejogi.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609198b395d6c---26050507444.pdfPDF link annotation
    • http://villa-margherita.biz/userfiles/files/55435019716.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b34346b2f9c---xekupegavobolototaji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=clozapine+davis+drug+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_off0000e317.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE317 18072 bytes
SHA-256: 1f2c26eb89a650c38b10236f2299f1e92b3f36986c11e9cb029a0fe69e9dd329
font_01_sfnt_off000111dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000129f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129F4 10832 bytes
SHA-256: 5de5e79fc0b9316cd6184a9895463186ae24e9390f6254257c54af4fb5dae715

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