Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc362e8913669e2a…

MALICIOUS

PDF

77.4 KB Created: 2021-08-10 07:00:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: bc048068cdaaf822d5ce58ee37867347 SHA-1: 8876c01ea899b05891dd3d5c59b9db609ed916b3 SHA-256: bc362e8913669e2acc3a4f010d87f1270aa05691e7399979b13eede80f97c9a5
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress upload storage locations, suggesting an attempt to distribute malicious content or phish users. The presence of numerous unknown URLs further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d8292020e4---kosakuvazafexijodov.pdf In PDF document text
    • https://b2b-intelligence.it/uploads/file/xariserovozinige.pdfIn PDF document text
    • https://activepymes.com/pub/file/73279771231.pdfIn PDF document text
    • https://horgaszvelem.hu/ckfinder/userfiles/files/nexanurodax.pdfIn PDF document text
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8e934b756---jogopitatagutinux.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160c7ab172f476---53619166095.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/61479257273.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/t63vpqkinf9djtfg12tst9shp6/25884531219.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff1cc2fa0f---35134778303.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/91cd2ac1116d0c939b6d8e856edea653/popakofawelisarajit.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/d4jnkmct4mh1ovpuehjdbnbs4a/netazabipow.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/949f8d6ff512d8fa66c226eb31720976/54885092869.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/fabaterutov.pdfIn PDF document text
    • https://sananselmo.com/wysiwygfiles/file/80182559541.pdfIn PDF document text
    • http://budohurtsa.pl/userfiles/file/tuwanusalolusuxasox.pdfIn PDF document text
    • http://latexindia.com/userfiles/file/lafekut.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/57413268613.pdfIn PDF document text
    • https://torbay.ru/images/uploads/file/79526559199.pdfIn PDF document text
    • https://delaneyllc.com/ckfinder/userfiles/files/19469369524.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072348579676---kixoniveguxa.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b8551b875b4---nuvafakugizozur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=tres+veces+tu+pel%C3%ADcula+completa+online+gratis+subtitrat+in+romanaPDF 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_off0000c5ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5AC 11048 bytes
SHA-256: 8c18acbb6f07ed2d487a30b74fb131e3eede6367db63b5f8cd7d6d07d700606f
font_01_sfnt_off0000df2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF2D 17836 bytes
SHA-256: 97226dc26405d6592d3963147ceec04165c3df2ba9facd2750bb6a86131cd6f1
font_02_sfnt_off00010c1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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