PDF malware analysis — malicious · fff7ddca6b202861

MALICIOUS

PDF

116.2 KB Created: 2021-09-01 06:35:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: 553dd901f54bda494b3d221a8bc84d81 SHA-1: ce8b100cec56300e1cf148fc5ebdb6574841548b SHA-256: fff7ddca6b2028618861994b3453f0d49b7e2554353c26b22be180bcb48fa967

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

Nyx PDF Classifier malicious score 0.9852

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://catamma.ru/uplcv?utm_term=plato%27s+allegory+of+the+cave+meaning PDF link annotation
- http://garantc.ru/userfiles/file/sakak.pdfIn PDF document text
- http://teranor.com/ckfinder/userfiles/files/jepofavasewoguzomi.pdfIn PDF document text
- https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/40ed7f68b84ae2b37465ce0e18cd534a/ramolebufoneguw.pdfIn PDF document text
- https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/eb547c078c5e6ab4c78d321dbfae671e/vopuzisisigek.pdfIn PDF document text
- https://inijariku.com/ckfinder/userfiles/files/vinupipasibi.pdfIn PDF document text
- http://arniestribu.com/campannas/file/gofowitizewuxososepew.pdfIn PDF document text
- http://budka39.ru/files/17295281941.pdfIn PDF document text
- https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160acb6bd6e5c0---nudevawewabofune.pdfIn PDF document text
- http://edison76.com/clients/5/54/54c13950cbd15a81e6fb4362eab8f273/File/89391838356.pdfIn PDF document text
- http://deltools.com/userfiles/file/33555271900.pdfIn PDF document text
- http://hagelkonzept.com/userfiles/file/lovupolufogelugimese.pdfIn PDF document text
- https://businesslife.com/content/files/69807772772.pdfIn PDF document text
- http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/janhdl7pot2pops1hjb5aleah1/kesolafekalutivamuvixu.pdfIn PDF document text
- https://parfumzone.ro/files/file/55202862903.pdfIn PDF document text
- http://www.sport-konyv.hu/userfiles/file/7358301603.pdfIn PDF document text
- http://pogologistics.com/ckfinder/userfiles/files/5823140647.pdfIn PDF document text
- http://phayaotechno.com/UserFiles/File/povepojexomok.pdfIn PDF document text
- http://4998horo.gmmwireless.com/contents/files/11682112901.pdfIn PDF document text
- http://gchsclassof1970reunion.com/clients/6/6a/6a45fbe13d63dbb0eb8070d7cb9dbc89/File/71425030619.pdfIn PDF document text
- http://mav-auto.ru/images/file/91895829245.pdfIn PDF document text
- https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce6667ef01---97842613634.pdfIn PDF document text
- http://ottotech.center/userfiles/file/fegizoladexuzumisibipa.pdfIn PDF document text
- https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608ecf6e2284a---bunupimudoboxol.pdfIn PDF document text
- https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160872bcb7bcb1---9332039997.pdfIn PDF document text
- https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/b7cdeb05a4c67c652d0eb1730a4d9616/69979582354.pdfIn PDF document text
- http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d1f86ce5d---zofutuxerowegafe.pdfIn PDF document text
- https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/d80683c36989c25acad7bd3c87930357/12129681385.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.

Filename	Kind	Source	Size
`font_00_sfnt_off0001565b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1565B	21912 bytes
SHA-256: `9c3eae68e003c264545322210e5da35f0d67da4378062888d6614ef485bcf748`
`font_01_sfnt_off00018f72.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x18F72	11000 bytes
SHA-256: `aed0c087068d55dfd668ae4593c98b8ec97f3bb9976daaf70dc84574260e51c2`
`font_02_sfnt_off0001a8f8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1A8F8	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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