Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a12cdcfde747f21…

MALICIOUS

PDF

80.9 KB Created: 2021-09-01 16:27:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 11ff10c0c4b625dd8c7116320c841552 SHA-1: d66578d1a13eb4938644d0566b642ca975e2e502 SHA-256: 1a12cdcfde747f215d77c865d5f7ffafefc04ffbec5200f32fdd5a3661ecbc23
164 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a link farm pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution lure, likely leveraging an exploit within the PDF reader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/v7q5iiphvsjiug4tog6ui710jc/tifadoba.pdf In PDF document text
    • https://fanaf.com/article_ressources/file/31700162500.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/c02ce1a25e16ba5b43c8019fead39009/riluxareborebil.pdfIn PDF document text
    • https://777mto.com/contents/files/2026015612.pdfIn PDF document text
    • http://cioccolatogallucci.it/userfiles/file/17868683736.pdfIn PDF document text
    • https://kimansion.com/uploads/file/sofitofukavarax.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/25e03a8ad6ccc2e1d4c62a9fded8d0bb/90200692356.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/konemezo.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16085a64b4a25c---mozab.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608aea887550b---5233385258.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef51e09c1a---motuvezatowir.pdfIn PDF document text
    • https://szalkasszorutacskok.hu/app/webroot/files/content/files/44458854021.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/1e612e2139d19124bb2c7c229da8d3c0/67850565151.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/zezanonijowidemepexarige.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/2b662997a0e356b33fb028528ed457d0/49409089033.pdfIn PDF document text
    • http://skikk.nl/app/webroot/files/userfiles/files/runomidujog.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16070c7783fea0---65794615872.pdfIn PDF document text
    • http://digitaldaya.com/imagenes/file/bevimoragurixolelolozakoj.pdfIn PDF document text
    • http://tokyosushilohaus.com/uploads/files/61784508023.pdfIn PDF document text
    • http://autowagon.it/userfiles/files/wukolapotavo.pdfIn PDF document text
    • http://anandtouristcorporation.com/uploads/dixizixaxuzulidaxotizotod.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6b07373d23---savoregiwepemujunonuf.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/ba0d0df97ca3867618061dbc10d78c5a/46117302938.pdfIn PDF document text
    • http://laptopplus.be/app/webroot/files/userfiles/files/56755481223.pdfIn PDF document text
    • http://chinalabware.net/d/files/rapidasodoloduxenono.pdfIn PDF document text
    • http://ms-krmelin.cz/app/webroot/files/files/74189602693.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=chocolate+cookie+triflePDF 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_off0000d696.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD696 18300 bytes
SHA-256: 678435d69020c4c4dac07c09be49a2a6bfd22c0198d73d01b8b049f7fb08c516
font_01_sfnt_off000105cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105CD 10284 bytes
SHA-256: 818a9d5edc566351f32a76c6a6a491e6fc878b1002fd9d24b82e0df30132fc5c
font_02_sfnt_off00011d1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D1F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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