Malicious PDF — malware analysis report

Static analysis result for SHA-256 37600e1dfed729ae…

MALICIOUS

PDF

92.5 KB Created: 2021-07-12 22:41:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 21cab61094bcf3ca6c5ca7b905ee50fa SHA-1: b3af418f987598bc1d8ed613fc75b15b2add9656 SHA-256: 37600e1dfed729ae87f4424391e6bf8a2e10bb105967d326375424d23b1be24d
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The heuristics indicate the PDF acts as a link farm, directing users to multiple compromised WordPress upload storage locations and disposable hosting sites. These links likely lead to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://nomylo.ru/uplcv?utm_term=what+does+it+mean+if+my+dog+is+breathing+fast
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c63b840d8db---85115728114.pdf
    • https://arendic.cl/files/remazuwazupiteg.pdf
    • http://tc-antey.ru/uploads/files/fiwiwewebudarojuzo.pdf
    • https://argumentua.com/i/file/malaxijotafilufew.pdf
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ae056cf36---maxavi.pdf
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bcb3ae32a1---tokurimowuwujutexekazut.pdf
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/90f8ade03ac62fca8935ce324f8dba5c/36062198622.pdf
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608775537adc5---simizo.pdf
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c2d098918ba---gamufumebel.pdf
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/e570083abe5a664a34ec47f835b2e9d0/xulodowixipijorage.pdf
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f63d5cc10---54928756973.pdf
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3a187a854---60597922222.pdf
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec11881985---32067526304.pdf
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2f996ed800---sekezifekak.pdf
    • http://asja-doll.ru/userfiles/file/sazuzejoluvegulisas.pdf
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160709920b954d---5507002525.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/bebd8ec5327c52a87b809022d67981be/raxikira.pdf
    • http://thebestpearsonfamily.com/clients/e/e6/e6a49a9b6fa3fb0349b1957bd02e8b5b/File/dawikuvis.pdf
    • http://z500.si/files/92101385482.pdf
    • http://townsendrogersfamilyreunion.com/clients/9/91/912616e09393d205379ff76530a10a1f/File/59702634779.pdf
    • https://peterdegendt.be/file/13624380064.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000108a1.bin
dc9fa2dbbed534adc5989d9cb9c0e04281ec84f036548039b5232cdc670c8555
pdf-font-stream PDF embedded font (sfnt) at offset 0x108A1 11004 bytes
font_01_sfnt_off000121d9.bin
2c32354a1f09c1f474e56b916d34658e9e48d4833a7327bd947950c5692eec32
pdf-font-stream PDF embedded font (sfnt) at offset 0x121D9 16536 bytes
font_02_sfnt_off00014cbf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14CBF 16792 bytes