PDF malware analysis — malicious · f5f2c4e671a99ad8

MALICIOUS

PDF

83.1 KB Created: 2021-09-13 21:26:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: 9902d905b5251aaf37d011861b2a503e SHA-1: 005f72581311f46e78de8cd7e9260ed747d026ae SHA-256: f5f2c4e671a99ad8c5b83c76f4dbe0521b8a8f1f1e09210e72d0676b900f0b30

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF used as a lure.

Machine Learning

Nyx PDF Classifier malicious score 0.9861

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://oniceh.ru/uplcv?utm_term=integrated+marketing+communications+4th+edition+pdf PDF link annotation
- https://festacontinua.it/public/file/pobagiweruzavim.pdfIn PDF document text
- http://maremio.ru/admin/ckfinder/userfiles/files/57069295211.pdfIn PDF document text
- http://pronobile.de/catalog/file/labaxer.pdfIn PDF document text
- http://www.hausbaumesse.at/ckfinder/userfiles/files/59747450812.pdfIn PDF document text
- http://888spirits.com/userfiles/file/nukup.pdfIn PDF document text
- http://pamatudarbai.lt/ckfinder/userfiles/files/xaxelanibaf.pdfIn PDF document text
- https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/7412ad163920b17597af2eda0e3a0160/84620020277.pdfIn PDF document text
- http://streathamtaxi.com/survey/userfiles/files/fofofasujegu.pdfIn PDF document text
- https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/d927f7b063164237b5f258ec376eea68/sonuwafal.pdfIn PDF document text
- https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/221a2c223ad0a521ee023b90a4339b1b/pejejokopigupazositineta.pdfIn PDF document text
- http://davidhammerstein.org/ckfinder/userfiles/files/bepixe.pdfIn PDF document text
- http://jamalcar.com/userfiles/file/zuvogiwiki.pdfIn PDF document text
- https://implant-drill.com/userfiles/file/91529534420.pdfIn PDF document text
- http://massiimo.com/piceditor/file/81712592307.pdfIn PDF document text
- https://sledovani2.gpshlidac.cz/www/userfiles/files/rusagiwejovepijapokov.pdfIn PDF document text
- http://shopsuathientu.com/uploads/userfiles/file/88863449451.pdfIn PDF document text
- http://ez-surveying.com/htdocs/cljr/data/files/lifuxekivoboneziwebuto.pdfIn PDF document text
- https://brtim.com/uploads/wysiwyg/files/gikuwubaxani.pdfIn PDF document text
- https://namhunglogistic.vn/site/files/fitovarozugiwajotidasupak.pdfIn PDF document text
- https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/0c0ce18b3c94d920cf7a151672fcebec/9400271885.pdfIn PDF document text
- https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161374037c354e---66707124747.pdfIn PDF document text
- http://sjzhtchem.com/upload/files/welegow.pdfIn PDF document text
- http://mikailang.net/userfiles/file/20210904093453_1498240548.pdfIn PDF document text
- https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/5ed2501e421a088247b58421c2f5bf91/ramejap.pdfIn PDF document text
- http://akbarestate.com/survey/userfiles/files/16082608180.pdfIn PDF document text
- https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/tozenanazi.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://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_off0000e08a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE08A	11240 bytes
SHA-256: `6a9e57a13f260b1e55c828e341161f5be0842ab9e2fb938efd2b51b076358659`
`font_01_sfnt_off0000fa83.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFA83	17828 bytes
SHA-256: `cedc642d8d9851dfebbaaa9bd37e1f3cca61cae33a9c1019aa86410cbafda9eb`
`font_02_sfnt_off00012868.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12868	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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