Malicious PDF — malware analysis report

Static analysis result for SHA-256 39cdc2544ddc549e…

MALICIOUS

PDF

71.2 KB Created: 2021-09-14 13:08:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 04b3258fcb4b522d05bbdb7299f7bbc9 SHA-1: cd02214ce5edd859ab677f72a4f4a00835d2f9a2 SHA-256: 39cdc2544ddc549e7c3a7c42f6448eb30d6d239b3518ba7ad463134a8dae2483
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content or phish users. While no scripts were directly extracted, the PDF structure and embedded URLs indicate a phishing or malware distribution vector, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/dit5vmsipsbf8i9c24n3uiqe1e/simakofoxedinuferijawijo.pdf In PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/9195d9666e36502132b54fd12071e885/22963679720.pdfIn PDF document text
    • http://cnsgawefgl.netsociality.com/upload/files/sumobimoba.pdfIn PDF document text
    • http://archive-2014.humandoc.pl/attachments/file/jimixigudo.pdfIn PDF document text
    • http://honeycontacts.com/uploades/userfiles/file/demabazijexerasufir.pdfIn PDF document text
    • http://kingswaytyres.com/project/kingsway/uploads/file/famuxozonowugumutake.pdfIn PDF document text
    • http://rcp-ranstadt.us/files/90999737261.pdfIn PDF document text
    • http://cuacuonbinhduong.com/upload/files/78928715969.pdfIn PDF document text
    • https://airxps.com/userfiles/files/rujimofexetapuvumekijon.pdfIn PDF document text
    • http://massimobertoarchitetto.com/userfiles/files/fotogezi.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/33248737166.pdfIn PDF document text
    • https://tyko.pl/userfiles/file/jilebitozakaxirajebagovi.pdfIn PDF document text
    • http://kozszemle.hu/uploads/files/tijibatu.pdfIn PDF document text
    • https://www.passion-rnd.com/upfile/files/2021/09/07/1842908791.pdfIn PDF document text
    • https://encoyun.com/calisma2/files/uploads/99528274938.pdfIn PDF document text
    • https://noursportevents.com/wheelmarine/userfiles/file/midow.pdfIn PDF document text
    • http://sherwoodonionfestival.com/ckfinder/userfiles/files/69513211219.pdfIn PDF document text
    • http://cayxaotamphan.net/userfiles/image/file/wugedatiwesupef.pdfIn PDF document text
    • http://phuquytravel.com/nguyenvanlinh/files/97040666876.pdfIn PDF document text
    • https://bursac.net/userfiles/file/43148252470.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613f3c814ee6a---75192550143.pdfIn PDF document text
    • http://4chan.ro/UserFiles/file/wufesavizama.pdfIn PDF document text
    • https://speak82.com/_UploadFile/Images/file/79554289874.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=undertale+fighting+simulatorPDF 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_off0000b5bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5BF 15784 bytes
SHA-256: be3fa3ff7cd93b18e4aa416cde0a51177107c7226212719cc8d5d6ede8682f2a
font_01_sfnt_off0000de7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f693.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF693 10908 bytes
SHA-256: 1f87605d4dfb16365df821645e7afe1587f9c53c0fc2f85230127523e8a5e6e2