PDF malware analysis — malicious · 883f3f72152d2b7a

MALICIOUS

PDF

98.1 KB Created: 2021-09-06 17:37:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23

MD5: c4cb70023361bda8d47281ee91841d91 SHA-1: cba865e9d1385115f2b292023b5bee2947ec6d26 SHA-256: 883f3f72152d2b7a02a9c729b114ee28f4634bd8af4bffbdd648833377281596

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites or disposable hosting. The ML classifier strongly indicates maliciousness, and the heuristic firings suggest the document is designed to lead users to download further malicious content. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware distribution lure.

Machine Learning

Nyx PDF Classifier malicious score 0.9876

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 http://allaboutdowney.com/userimages/gamitep.pdf In PDF document text
- https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/c2ba9787ec4807e7a6fd31d30684fb91/24646862545.pdfIn PDF document text
- http://eltprof.ru/userfiles/file/wisugividemalagifawoz.pdfIn PDF document text
- http://hart-metale.pl/gimnazjum/userfiles/file/82385380290.pdfIn PDF document text
- http://kientrucnhacuagio.com/upload/files/vufamid.pdfIn PDF document text
- https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa1550cf96---69526971382.pdfIn PDF document text
- https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb9d7b6445---vegijudusazijuti.pdfIn PDF document text
- https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/er5i5fm1f5tf2tgtnujr46kq74/88214605559.pdfIn PDF document text
- http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ade607ae0d2---zapanon.pdfIn PDF document text
- https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/611353242fe703156f674259d4523117/4216121701.pdfIn PDF document text
- https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7069386b4e---xodusolinibomabobox.pdfIn PDF document text
- http://timeyear-v.com/userfiles/file/99315894718.pdfIn PDF document text
- https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098872f0fe81---limunelesixuwimabokiz.pdfIn PDF document text
- https://leavingcare3plus.ch/userfiles/files/25810691716.pdfIn PDF document text
- http://akkoryazilim.com/userfiles/file/senevilesasefubupumikigof.pdfIn PDF document text
- https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c50e51e2017---fatuxuno.pdfIn PDF document text
- http://atrsara.ir/resource/files/gefonoderelabevazijitowew.pdfIn PDF document text
- http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fa02426b1ec---46521178783.pdfIn PDF document text
- http://jaqalsports.com/files/file/fujofixogurugi.pdfIn PDF document text
- https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/fc0268b7757fff4bd4ca9bbfec9e3a63/dewesefuzovamolajamuv.pdfIn PDF document text
- http://ahlhy.com/uploads/file/172234103417.pdfIn PDF document text
- http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/fkcga7jm7cu87ps1i3dv2s5en3/webuz.pdfIn PDF document text
- https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/896ee3c1fe918e147b97bfcbce6f09b6/40564015653.pdfIn PDF document text
- http://whippets-au.com/clients/7/7f/7f5032e15db821a993a8146895416847/File/jajepemogixozefi.pdfIn PDF document text
- https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608016eb0f80c---jasavurifanomewezegusu.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eae8e9ec8d---sogunuranirulojura.pdfIn PDF document text
- http://portalcom-b2b.es/img/user///file/_0226564001621369262.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=el+almohadon+de+plumas+pdf+descargarPDF 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_off0001126f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1126F	10960 bytes
SHA-256: `6c5879ce3bc72da4a44029ec527a09da43f7c6bcb1d59410972620d8932fbb1d`
`font_01_sfnt_off00012b64.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12B64	21376 bytes
SHA-256: `97f532a34f77ddc268c9c1da5c6b6057a49888b561c7c9bfc9366c42d65a8f91`
`font_02_sfnt_off0001622c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1622C	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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