PDF malware analysis — malicious · bb0f14e5b7330212

MALICIOUS

PDF

83.1 KB Created: 2021-06-28 22:57:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13

MD5: ac4ef46430c8562fb40668f62fc7fc37 SHA-1: 010cb4bfdf5d15ed8b650b7b56c30036190852f6 SHA-256: bb0f14e5b7330212067b99e978e7a0ab764ee48c718da90f42a568df1d21440e

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs that point to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is a phishing or malware distribution vehicle. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

Nyx PDF Classifier malicious score 0.9860

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://krisoc.ru/uplcv?utm_term=to+call+a+monster PDF link annotation
- https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/49e9b7ad31df2a4dded82eb2b6e62d4b/60465647451.pdfIn PDF document text
- https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/64iq2goaiuh4u1gdss7q232ob6/gokolakepov.pdfIn PDF document text
- https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e099a6f395---90269955961.pdfIn PDF document text
- http://gdbchurch.com/clients/43262/File/lebipivuvuxapitiboveti.pdfIn PDF document text
- https://travelinnsuites.com/nbloom/fckuploads/file/patomuzejod.pdfIn PDF document text
- https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/bb8e2a1be2505d6f2145b8c36bba4f5d/jokuvivexu.pdfIn PDF document text
- https://topclassgreenery.nl/images/file/48443060361.pdfIn PDF document text
- http://fondationmonetoile.org/clients/0/0e/0ecfe6182781ff486fe5156d2e85c11d/File/toginujisemisojo.pdfIn PDF document text
- https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160821954be9a4---66256593759.pdfIn PDF document text
- https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/cdm50rhs7st4tctlpgtdahibj2/97121176508.pdfIn PDF document text
- https://alshaabcoop.com/userfiles/file/dikalemugegar.pdfIn PDF document text
- https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/3e1cdb1301ecb384dcfbff02f5294b64/57593798107.pdfIn PDF document text
- https://betenenergy.com/sites/default/files/file/32613328087.pdfIn PDF document text
- http://aliceinformaticasrl.com/user/pages/pajajizejesebasovegutade.pdfIn PDF document text
- http://tksvolga.ru/userfiles/file/11232539460.pdfIn PDF document text
- https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608506ebcd9fa---lowilejavi.pdfIn PDF document text
- https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/f3e348434c47f035ced99fd2e17a9f56/97515781974.pdfIn PDF document text
- http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c983a60befd---48454506628.pdfIn PDF document text
- http://93564497.com/userfiles/37633161160.pdfIn PDF document text
- http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160718b6c4bbf1---fufipikufaka.pdfIn PDF document text
- http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7d283acc5---zexukusigefawusiwo.pdfIn PDF document text
- http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160740ca6e542c---nanimerodasu.pdfIn PDF document text
- http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cec5e19250---jawojalojodob.pdfIn PDF document text
- http://royalgoodviewresort.com/Uploads/file/97318073748.pdfIn PDF document text
- https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a90a720ceb7---gajuxelodobizowam.pdfIn PDF document text
- http://ksnjl.com/userfiles/files/82535353188.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_off0000e15c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE15C	17968 bytes
SHA-256: `654e7fdb4418d1d5f360298057ba084d60d2f997e5cc815c8d5958a9d3a70356`
`font_01_sfnt_off00011018.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11018	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0001282f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1282F	10260 bytes
SHA-256: `2bd5172df7828e4ac0dc17624f2d0a4af3f56d51864ce9d9cf2cafda6ab46a77`

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