PDF malware analysis — malicious · a6869cb86553d3f1

MALICIOUS

PDF

111.8 KB Created: 2021-06-28 23:27:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13

MD5: 4c9dc8754552bda2829ac5ecb07996ed SHA-1: 8c16091fb699f6d2ff079e4efeedbe7d29a5bccb SHA-256: a6869cb86553d3f1d17dbc18094139f7eae3f23ee1dc0200f4d802a11b942dfa

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous embedded URLs that point to compromised WordPress sites, which in turn host other PDF files. This suggests a link farm or redirection scheme designed to lead users to malicious content. The ML classifier strongly indicated maliciousness, supporting the interpretation of these links as part of an attack chain.

Machine Learning

Nyx PDF Classifier malicious score 0.9885

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://cructi.ru/uplcv?utm_term=vowel+and+consonant+in+bengali PDF link annotation
- https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a0e4f3f2cf3---28641855261.pdfIn PDF document text
- http://interiorconsignments.com/media/file/josikumosoli.pdfIn PDF document text
- http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/96d3d007d5894a3b3e90947000098945/xevugibolokaj.pdfIn PDF document text
- https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e3e6a98732---vafekuba.pdfIn PDF document text
- https://electrabicycles.pl/app/webroot/uploads/file/1620966393127.pdfIn PDF document text
- https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/dnpqch1isrv16fc4crdamujbt2/22710088646.pdfIn PDF document text
- http://stacjaregeneracja.pl/userfiles/file/xogifelodafagigepagu.pdfIn PDF document text
- http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607380f5dd61b---lowalawuxap.pdfIn PDF document text
- https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/3c1e7146e801aec3343b8e5f1c42d284/xutasujuzode.pdfIn PDF document text
- http://theheavent.com/userfiles/files/pizime.pdfIn PDF document text
- http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd1299b7b3---60979889750.pdfIn PDF document text
- http://namngonviet.com/user-/files/64442979875.pdfIn PDF document text
- https://fidelishospice.com/ckfinder/userfiles/files/42987860013.pdfIn PDF document text
- https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/246e9b82d818121011677c3017403393/xonofokojixivolota.pdfIn PDF document text
- https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/6096f36e9d451f78717fd9147ac52731/molaxekubigevonepapi.pdfIn PDF document text
- http://nature-revive.org/files/file/xarelupopet.pdfIn PDF document text
- https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/0uq55k9aosogqskcclpiipddrg/mozuponabude.pdfIn PDF document text
- https://dalton-english.com/userfiles/file/57161568861.pdfIn PDF document text
- http://novussiteyonetimi.com/uploads/file/11448388582.pdfIn PDF document text
- http://iberia-ex.com/images/blog//file/remujuwujagefilijefa.pdfIn PDF document text
- http://myxroad.com/upload/userfiles/file///fepusomozego.pdfIn PDF document text
- http://vantaibactrungnam.vn/upload/files/kafujotef.pdfIn PDF document text
- https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bf900850103---63870271771.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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off00013655.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13655	16088 bytes
SHA-256: `0e3d63f173342003c62a86c726d4d5a85e7f52d44cf06618766a4fa08a0866bf`
`font_01_sfnt_off00014b88.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14B88	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0001639a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1639A	20528 bytes
SHA-256: `10af0e4365d968a9afe0e5af29304b721f25e585326c4bcd53289a2fe8b2f154`
`font_03_sfnt_off0001976c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1976C	10640 bytes
SHA-256: `9f4a56458d2d4655189440595cbc3ecbd454fa2d27b29e7281ae3cd37d7d63af`

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