Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c8c66d12b10b7c6…

MALICIOUS

PDF

74.1 KB Created: 2021-07-14 05:36:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 633138c631c6a5d1e21daefe53211ce8 SHA-1: 3a2897652b4c40a20025f21934b3fab951d76d3b SHA-256: 6c8c66d12b10b7c6ea9c23a81169d70a1bdce30d7767674d1d7368e9d5917f95
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. The presence of multiple distinct hosts and URLs suggests an effort to distribute malicious content or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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 http://amadpich.com/userfiles/file/kisufarirogoxotix.pdf In PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c4023e9c99---jalamufuf.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/g40iuopbbnk44egh9jevruqs33/pufufixepi.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/4f705990eb00c6ea38d1a34bdd1b2611/loxowanadilerupagatowa.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c9def1704---81930614723.pdfIn PDF document text
    • http://inciboya.com/resimler/site/files/95909750864.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/walis.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16079e147448eb---84705645443.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/69118207363.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607901114f8e1---vinedakolixenedaboropanin.pdfIn PDF document text
    • https://whatproperty.ng/ckfinder/userfiles/files/23001281394.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090d399d4014---72738734799.pdfIn PDF document text
    • http://zamokugrofa.sk/admin/fckeditor/file/dofires.pdfIn PDF document text
    • http://computer-rudolstadt.de/upload/file/jezusijukokoxezisup.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/16099b11562736---8967102621.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/vcfblh8q0i774k6rdquk0apgl4/mibizikijeniwimasotaf.pdfIn PDF document text
    • https://areicon.com/images/file/toxixisa.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b774155b672---32101375509.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/simuvosizifinedatasezet.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1606da3800a55f---80777454988.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/04b745db8f17e62464d6e64c59bc5a0b/rotugilovevanog.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/7d21881ca341683b2aac1225576d5e27/meludopusen.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/2d3e2d3d28a573f31a8193f2d6ed68dc/zarudigigunolex.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/90477185763.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/dasesopopotinatim.pdfIn PDF document text
    • https://penzionradvanice.cz/res/file/87544429453.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/pafugorol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=ch3coch3+lewis+structurePDF 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_off0000bee6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEE6 10448 bytes
SHA-256: 148436023b4699cc1075855df2336b67a6c1dbbd439b93627ef221a579e80efa
font_01_sfnt_off0000d6e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eef6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF6 16420 bytes
SHA-256: 048a4704bd112da9981cddcf300e08f99078b854eacab09132aa1af8c321d7b0

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