PDF malware analysis — malicious · a3ae2778456977fa

MALICIOUS

PDF

89.2 KB Created: 2021-07-05 13:47:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14

MD5: 4c6bbfa158ea086ac8a29e7e14e59ffd SHA-1: 08418b3f864ca556ecb8329acf17c378bde9494c SHA-256: a3ae2778456977fabc9bf87069fc423e45bf3dcd8e283022b2b58f1ffa5b8a42

196 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1539 Steal or Harvest Session Tokens T1056.004 Web Browser

This PDF document is identified as malicious by ClamAV and an ML classifier, strongly indicating a phishing attempt. The 'SE_MFA_LURE' heuristic reveals that the document is designed to harvest multi-factor authentication codes or session tokens. The numerous embedded URLs, many pointing to compromised CMS uploads, likely serve to redirect the user to a phishing page.

Machine Learning

Nyx PDF Classifier malicious score 0.9835

Heuristics 7

ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
MFA / one-time-code harvesting lure high SE_MFA_LURE

Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
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://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/dd6637f4e5bfd61d087ac32b4e371492/53957442152.pdf In PDF document text
- https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/ca5d7c269ffb211e6aaa142e5b5b6d32/xakibimamomonob.pdfIn PDF document text
- https://alarouba.com/ckfinder/userfiles/files/duwexivivateke.pdfIn PDF document text
- https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160828b7e2abf2---36597005029.pdfIn PDF document text
- https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/80bcb5a9f96d1e33ddfa7f3f9a9a8da3/vugibapajur.pdfIn PDF document text
- https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/a8e479201dc2e6595eb38c643502b4cf/34305057543.pdfIn PDF document text
- http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160736387ddf42---digomajoxosamupifubifufuw.pdfIn PDF document text
- http://vivaldiskibus.com/FileData/ckfinder/files/20210703_55A8CDEF278DFFFC.pdfIn PDF document text
- https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/ch2uih0jlq3e5d7kh50nkjra8m/77507853205.pdfIn PDF document text
- https://aduanaldelvalle.com/userfiles/file/9275929328.pdfIn PDF document text
- http://sattamatkapatti.com/userfiles/file/jimodoxurelejemu.pdfIn PDF document text
- http://osc-pribor.ru/products_pictures/file/berubuwabimebenufa.pdfIn PDF document text
- http://drapa-technika.cz/UserFiles/File/salajadosawuta.pdfIn PDF document text
- https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/sdukcie5uonk7ndjr8gg4gdjgl/xalonukubumisaloto.pdfIn PDF document text
- https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16098a1aa3f1d7---vupopafotiruxogavateta.pdfIn PDF document text
- http://shihtzufurbabies.net/clients/d/d3/d383cf0c90cf2d2391705d5438694b4c/File/pibiwubuxejela.pdfIn PDF document text
- http://cdwy028.com/uploadfile/file/20210609230123.pdfIn PDF document text
- http://lahma.pl/_u/userfiles/file/tovure.pdfIn PDF document text
- https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/41dd666595d04f6aace7ba70156e955b/75292285765.pdfIn PDF document text
- https://cabsfromheathrow.com/userfiles/file/paxivepebubuxakesoxek.pdfIn PDF document text
- http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ca3c3fdfa74---44751235821.pdfIn PDF document text
- http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/1b5d34408e6138ba673a75c5463477f2/bamijab.pdfIn PDF document text
- https://anmoul.com/userfiles/file/98762317629.pdfIn PDF document text
- https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607339052e2fc---fekenuwisuzilimivigowe.pdfIn PDF document text
- https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/583161efd046f998a9b05ed1f3443112/barobejirawajot.pdfIn PDF document text
- http://trendymamy.pl/userfiles/file/96984200738.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+fill+and+save+a+pdf+formPDF 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.

Filename	Kind	Source	Size
`font_00_sfnt_off0000f946.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF946	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0001115d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1115D	10804 bytes
SHA-256: `a192db2b6466ff10b1c92488822b7ead9db6e8cb9f4005b2f2ca73151aea1f65`
`font_02_sfnt_off00012a37.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12A37	17208 bytes
SHA-256: `0fd1868782373c7a9b0865fbb0e527884d7ff0d17ff5156b239bc7a581df7193`

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