Malicious PDF — malware analysis report

Static analysis result for SHA-256 27404a0814aee9e7…

MALICIOUS

PDF

86.3 KB Created: 2021-09-16 07:36:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0c224656f7d023675034a47f20d3aa17 SHA-1: 5aa61683b1caeb764b42bf48aaf74afbb4631176 SHA-256: 27404a0814aee9e776ee6cb6aa774137c40dc28ad4a9d66aa04eaab8bad37fd2
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous external URLs, with several hosted on compromised CMS uploads or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://autoandtruckrepair.net/nbloom/fckuploads/file/vojumanoxiwamupafiwitubu.pdf In PDF document text
    • http://barudan.hk/UploadFile/file/20210906075022580.pdfIn PDF document text
    • https://pellevah.com/upload/files/ziribaduxajogubazagisoj.pdfIn PDF document text
    • https://hobbypet.cz/files/file/saxisafo.pdfIn PDF document text
    • http://yogo110.com/userfiles/file/jodapamowobigakenododo.pdfIn PDF document text
    • http://foodzipo.com/uploads/userfiles/files/mevabowubevekis.pdfIn PDF document text
    • http://boilerservis.ru/uploads/files/94504282391.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c2add3ba00.pdfIn PDF document text
    • http://maxbrio.kr/files/files/59383597702.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138c4669f772---noluvizegizo.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613443bc48d82---bubanenodexabevo.pdfIn PDF document text
    • http://scarpatti.com/files/48744832628.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a1085e83ba---209063358.pdfIn PDF document text
    • https://taybaite.com/userfiles/file/56182367358.pdfIn PDF document text
    • http://rheumatology.institute/upload/content/file/17682480802.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library/File/sovaxuriterozimut.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136f183dd3a8---60196684523.pdfIn PDF document text
    • http://e-skala.pl/userfiles/file/kemam.pdfIn PDF document text
    • http://semihkerpiccilervesupersound.com/upload/file/rerozigoranuzodejulif.pdfIn PDF document text
    • https://narellesastro.com/userfiles/files/91432958774.pdfIn PDF document text
    • https://erdenet.mn/userfiles/file/35073816024.pdfIn PDF document text
    • https://centrumschoolka.pl/photos/file/nosoz.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/ragagejog.pdfIn PDF document text
    • http://cheliabinsk.realxenon.ru/uploads/files/16576635215.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=colony+building+games+androidPDF 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_off0000f06c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF06C 10876 bytes
SHA-256: 92fd655bcaa9e9651cce3ca699d486f14f6f70a78f5452acb8f8d385122a9ab7
font_01_sfnt_off0001094c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1094C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001215e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1215E 16480 bytes
SHA-256: c69f36564aeb114ddff03c3dc6bcc9e99ddf708b6bed9a2c30291808a2509c0e

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