PDF malware analysis — malicious · d6b1f8e1a007c5c6

MALICIOUS

PDF

81.8 KB Created: 2021-09-26 16:02:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25

MD5: c101895882e00d69b9889c5540ed3d25 SHA-1: cfa1b73223754ff9bd886f7b7ba5175c8b47c6f1 SHA-256: d6b1f8e1a007c5c6516008b30b007086f16746716cd7177c8378e10302c5ff83

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The presence of numerous external URIs, many pointing to compromised CMS upload directories or disposable hosting, indicates a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, suggesting it serves as a container for these malicious links rather than user-facing content.

Machine Learning

Nyx PDF Classifier malicious score 0.9933

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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://wastran.ru/uplcv?utm_term=hanuman+chalisa+bengali+reading PDF link annotation
- http://innovatepc.com/userfiles/file/25133097508.pdfIn PDF document text
- https://tarsiman.ee/files/file/66080101325.pdfIn PDF document text
- http://huzatfokozo.hu/editor_up/19095238356.pdfIn PDF document text
- https://casasholidays.com/scgtest/team-explore/uploads/files/68447976406.pdfIn PDF document text
- http://cjmfgx.morefriendship.com/upload/files/ralapoxijabapasame.pdfIn PDF document text
- http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/161416333d698e---74269183663.pdfIn PDF document text
- https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/1d8f5ba8955fca2f6904a420e541993e/gulazoda.pdfIn PDF document text
- http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132b481b88f2---mumafuwelobod.pdfIn PDF document text
- https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/0c1aa660118741668fabf200f6e2f318/78699077479.pdfIn PDF document text
- http://eastindiaspray.com/suvra/eastindia_spray/files/nuzetuferatamupumafotij.pdfIn PDF document text
- http://cdwy028.com/uploadfile/file/20210911062446.pdfIn PDF document text
- http://aggengr.com/uploads/CMS/file/96668612645.pdfIn PDF document text
- http://studiosantese.eu/userfiles/files/48344956034.pdfIn PDF document text
- https://weekendtripskolkata.com/userfiles/file/tuvakixixojikurujo.pdfIn PDF document text
- http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161359c7af2827---49762645459.pdfIn PDF document text
- http://hairfibers24.com/upload/file/zikamaborowowuzi.pdfIn PDF document text
- https://nezrenweb.com/calisma2/files/uploads/gopef.pdfIn PDF document text
- http://klhl.com/userfiles/file/13739975748.pdfIn PDF document text
- http://abc-tel.ru/data/File/vimegobulobabovijas.pdfIn PDF document text
- https://gemma.lucien-sv.info/uploads/files/613d25bb1580c.pdfIn PDF document text
- http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1613a44eae533d---16396895694.pdfIn PDF document text
- http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613c3462d370b---dowixof.pdfIn PDF document text
- http://bigbulkbags.com/survey/userfiles/files/zixebovarubugijoxititur.pdfIn PDF document text
- https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/b9019203fb565dcfe310871122f36976/tunasifiguravi.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
`stream_004_off000107dc.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x107DC	16668 bytes
SHA-256: `6c00ceac780d3f422ddef1c614ceb0fce5064fd832f35bc1808fe21ba17941ab`
`font_00_sfnt_off0000b9f7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB9F7	21008 bytes
SHA-256: `a455b7dff674af806b31709d7c12c9932e40ce878a7c6a9b0da226e9cf3fca7f`
`font_01_sfnt_off0000efcb.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEFCB	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_03_sfnt_off00011f2e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11F2E	10828 bytes
SHA-256: `80055c313dcd5fc67c24e3ac85e731fb1c1af8e5d3738dcfa2daa7722fde6412`

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