PDF malware analysis — malicious · 147c86f11f77aaff

MALICIOUS

PDF

156.5 KB Created: 2021-09-05 05:57:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: e9a457019dd50b2757c724c914659330 SHA-1: 0418ff740cc7e114057fee3ddca50bf79dc3b622 SHA-256: 147c86f11f77aaffb1f629dcee66eb214402cef7ce70bbb8dc0d35a788330eb5

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm used for phishing or malware distribution. The ML classifier strongly indicated maliciousness, and the presence of embedded URLs points towards a spearphishing attachment attack vector. No scripts were extracted, limiting the analysis of specific execution techniques.

Machine Learning

Nyx PDF Classifier malicious score 0.9706

Heuristics 5

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://kaktutzhit.by/uploads/files/gafubikolega.pdf In PDF document text
- https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/beheiifqel86q8g8d7ari5bpq4/kafejilazol.pdfIn PDF document text
- https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606de31ed03e6---jawuwi.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6d1927e43---99028855252.pdfIn PDF document text
- https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/96vac3ob2o9155ct305ci6ibg5/jarerigadapejesokujo.pdfIn PDF document text
- http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e316701a39---kevagipuwelutawagu.pdfIn PDF document text
- http://studiofantino.it/userfiles/files/15829885425.pdfIn PDF document text
- http://sghscsjamarai.org/guruhargobind/userfiles/file/78794436063.pdfIn PDF document text
- https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/vj17c01c6hao14smj2re5uk54o/82578117934.pdfIn PDF document text
- https://bataretak.com/img/files/file/wuridewovovapuxibajume.pdfIn PDF document text
- http://varadimasszazs.hu/uploads/files/feviforipisamukik.pdfIn PDF document text
- https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/40c1117222a0cc5b7b641d7fff28cfe9/5766183836.pdfIn PDF document text
- https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/zavesonelam.pdfIn PDF document text
- https://ytdrive.com/CKEdit/upload/files/fasuwibetuxujiwuru.pdfIn PDF document text
- http://regmac.net/userfiles/files/58159140762.pdfIn PDF document text
- http://glassco.ca/clients/9/99/99aa1728c1dafa3cf8773a75727b87c9/File/9145029561.pdfIn PDF document text
- https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c9a4f997576---tamaxitesizefa.pdfIn PDF document text
- http://laboratoriologos.it/userfiles/files/foritorosu.pdfIn PDF document text
- http://illinoislivestock.org/userfiles/file/92111510700.pdfIn PDF document text
- https://krono-original.vn/Images_upload/files/88518920627.pdfIn PDF document text
- https://giverny-bkk.com/upload/files/99897737345.pdfIn PDF document text
- http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160884e522e569---39260313490.pdfIn PDF document text
- http://martonelektro.hu/files/file/59800269911.pdfIn PDF document text
- https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/0069153eb324f3ef1d77c952663764f2/wutojanokanege.pdfIn PDF document text
- http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612553105a802---talizusuruvikil.pdfIn PDF document text
- https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a2670be3b2---2505582832.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=candide+pdf+resumePDF 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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0001ebd7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1EBD7	1888 bytes
SHA-256: `228445a3744f13af4bf84041e55802a923554d86926eb0745489ea117e4ab105`
`font_01_sfnt_off0001f4a0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1F4A0	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00020cb7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x20CB7	10528 bytes
SHA-256: `21586d1abeaa71519c584550d7a1f54f5a403dff932c1c9224d219151c1f8260`
`font_03_sfnt_off000224a0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x224A0	23844 bytes
SHA-256: `7249562acf510b11a6fe78912b91fa6580ae8ebbff4dfa292cfd89704baf64e8`

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