Malicious PDF — malware analysis report

Static analysis result for SHA-256 e43e4f5dc9e5d2f6…

MALICIOUS

PDF

80.8 KB Created: 2021-07-04 04:14:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 57e4e656900c1b9196805dd008418b76 SHA-1: 58c608e89a328ca702c6e93b4fed02bce532e859 SHA-256: e43e4f5dc9e5d2f6812532a8ccd0d87ede1b7ecc983fb059189390e441b88c39
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://allytemp.ru/uplcv?utm_term=how+to+convert+word+to+pdf+with+embedded+links+mac PDF link annotation
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/dff656b89ed6acf374da9582c640bd41/6321415299.pdfIn PDF document text
    • https://alteanetworks.fr/img/file/75034319455.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/lepekemetolijofujesatopiv.pdfIn PDF document text
    • https://beatmuellerfoto.ch/userfiles/files/39009291977.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/40071619020.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f41b0fc29---40854493473.pdfIn PDF document text
    • https://okazdedziecko.pl/_files/Media/file/98015898474.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/308ca1600bac261281dbfbd9ab462387/51347783206.pdfIn PDF document text
    • http://samrayburnclassof1980reunion.com/clients/873185/File/zesipaloj.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f75f877a6c---jidisajax.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/tupajijagal.pdfIn PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/xiwasenulomixikeviwo.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/3a1af3df3f9d1f79eb764fac77fffffc/56188743881.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/ce402efa5fd9d923a1a9d16734039bd7/komazezodowen.pdfIn PDF document text
    • http://logtech.cz/foto/Image/file/10645290420.pdfIn PDF document text
    • http://parfumerieindex.nl/images/uploads/80478115249.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609851665baa3---38015204076.pdfIn PDF document text
    • https://thedestinbeachhouses.com/wp-content/plugins/super-forms/uploads/php/files/a40cde510f4f959df167586ce252123c/10602746117.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e40a7931d7---vakajukuwuwadut.pdfIn PDF document text
    • https://schmitz.cz/res/file/tugemoruwiv.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/crqurbpp629j04norihkvveia1/babipezurotofe.pdfIn PDF document text
    • http://khochailo.com/upload/ck/files/mopos.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b43f10cf1ab---dukowuguzawox.pdfIn PDF document text
    • https://lensprovn.com/ckfinder/userfiles/files/34487531798.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f4dea990b---kegurozekejod.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_off0000d769.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD769 11260 bytes
SHA-256: 0a530dffcb5d9045a197630376965e0918c179f8037ca30f8446491f2eb145b9
font_01_sfnt_off0000f165.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF165 16864 bytes
SHA-256: db44ea42a7ae62881912574b73be2df1393411d46410855b30b3a7607c931c9a
font_02_sfnt_off00011d7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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