Malicious PDF — malware analysis report

Static analysis result for SHA-256 acf8bb9f0950a916…

MALICIOUS

PDF

96.7 KB Created: 2021-09-04 23:50:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 107fde9e3f3d754e95d866d05de52ab8 SHA-1: cdc4ede4902c1fd690d1ed680894f7288ffeab5d SHA-256: acf8bb9f0950a9164f9ad323ff9d492c7ab1aff86e99928a99b6ea6bb49470df
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of links, many pointing to compromised WordPress upload directories and other disposable hosting, indicating a link farm. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for human readability but rather for SEO manipulation or to host malicious redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://grupafurman.pl/!mag2011/userfiles/file/modobo.pdf In PDF document text
    • http://fedico.ca/upload/editor/file/9929730542.pdfIn PDF document text
    • http://skyline1968.com/clients/74864/File/siwekerapepalozuxemor.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/96bdc4b07d5e817f05fe11f45bda8ff6/66038282126.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a856df89d55---48495850365.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e95374497ed---16764662847.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a37a1d1f700---konupamazafadu.pdfIn PDF document text
    • https://speedwayinfo.hu/uploads/file/87639215691.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160866575e201d---5362862061.pdfIn PDF document text
    • http://mintaialuminum.com/d/files/puzojigukuvulaluwasoseb.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/kubapunimebasatifigaxes.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/25319720353.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/5jp1utb7ittj8es4bjil67dce0/92193784905.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b8d2892e457---70797778233.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16116d406e3e4e---88809122532.pdfIn PDF document text
    • http://sbox-technology.com/upload/datoteke/zinufukabepuwemudatu.pdfIn PDF document text
    • http://coinproject.com/userfiles/image/file/89201865335.pdfIn PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021072117454273499.pdfIn PDF document text
    • http://www.cerel.eu/images/wyswig_images/file/pulizamodonalup.pdfIn PDF document text
    • http://xtra360.net/campannas/file/87317810518.pdfIn PDF document text
    • https://iskoruma.com/upload/ckfinder/files/pakawapiwalez.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/domftg1ovamiiovor7igkc1d55/71853297227.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=piyush+publication+gpat+book+pdf+downloadPDF link annotation
    • http://pro.ovh.net/~tribuene/images/banque/file/xobaludifigobu.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_off000111af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111AF 11200 bytes
SHA-256: f82579065b12ddfc6466eb0db57b24f2e4e4b610d4b91d0492865c4a7cb923a6
font_01_sfnt_off00012b86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B86 18940 bytes
SHA-256: 5674acebfc73ac8be0897e0c74092566542c0032f37c0d1a375d06fd90b18af8
font_02_sfnt_off00015ccc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CCC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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