Malicious PDF — malware analysis report

Static analysis result for SHA-256 882ace5167f759c7…

MALICIOUS

PDF

75.5 KB Created: 2021-09-02 19:32:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0fc04ca494e0ea5a24b0b4e91c6c089f SHA-1: 45a79eff1bbfe72609dc356d3d649817193c6e8f SHA-256: 882ace5167f759c7e75f0c372f704fde9d123020af8adeb59372e5175934390d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many hosted on compromised WordPress sites, suggesting a link farm or phishing lure. The PDF structure and embedded URLs point towards an attempt to redirect users to potentially harmful external content, possibly for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://inwebjor.ru/uplcv?utm_term=health+education+and+community+pharmacy+book+pdf PDF link annotation
    • http://contentworks.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4a0f4f226---80001836849.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/82097998895.pdfIn PDF document text
    • https://berbagiangka.com/contents/files/75275082573.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b3e7c6016---zuzivemafidulobamuriwiki.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/pqmpvd7ploh1nruam7hppaosk4/66676658707.pdfIn PDF document text
    • http://gd-weimi.com/upfolder/e/files/20210610025245.pdfIn PDF document text
    • http://gediklimakinahidrolik.com/resimler/files/99310194734.pdfIn PDF document text
    • https://smg.bid/ckfinder_userfiles/files/bapoxuduluju.pdfIn PDF document text
    • http://creativecoms.net/userfiles/file/befalodezo.pdfIn PDF document text
    • https://shreenathtechnologies.com/userfiles/file/98565887211.pdfIn PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/54167391535.pdfIn PDF document text
    • http://1night2daytour.com/ckupload/files/25272733435.pdfIn PDF document text
    • http://perchegouet.com/ckfinder/userfiles/files/gobefalowitojalar.pdfIn PDF document text
    • https://weddingitaly.jp/images/file/79530012524.pdfIn PDF document text
    • http://avondale61.com/clients/e/e2/e25739fb73bf6f2fbed92e75d980d6c5/File/rifizibej.pdfIn PDF document text
    • http://koala-al.com/d/files/97189107718.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/ed814f7502c149caacad6be8d2605db4/99650783762.pdfIn PDF document text
    • https://thepainter.asia/upload/files/56866982582.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/6d0f186a9ea5a0f6de4d4aec59e17c90/gavojo.pdfIn PDF document text
    • http://blackshirts1962.com/clients/f/f2/f245580d3072b78cda2271cf7a7e3f61/File/jasaforajurowi.pdfIn PDF document text
    • http://sinproval.it/userfiles/files/nemogesoledigaviloturiv.pdfIn PDF document text
    • https://ganport.pl/userfiles/file/28338832454.pdfIn PDF document text
    • http://pelesiuvalymas.lt/i/File/15724973127.pdfIn PDF document text
    • 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_off0000c30a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC30A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB1C 16892 bytes
SHA-256: d7c3859589aa855c83df743f660f17f6a9c94de5deef61e0e8cbf301883e1714
font_02_sfnt_off00010683.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10683 11152 bytes
SHA-256: f8edfd56819ae2af832e2161a0f5f7be4b3257fc76ea7d8da89c878a0eb1881b