PDF malware analysis — malicious · 4e095fd1582f5a01

MALICIOUS

PDF

75.2 KB Created: 2021-09-07 11:17:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: a699043c12663f29be3b5deab954d274 SHA-1: e4316f4c61ba3898364b16419b0b89dcfda6caba SHA-256: 4e095fd1582f5a012c9b7a99f38c9b1e16ac0278e22499957144fb27e72f4bd7

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 various domains, many of which appear to be compromised WordPress sites used for hosting. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a deliberate structure designed to distribute links, likely to phishing pages or malware. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9947

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://wastran.ru/uplcv?utm_term=nfl+week+12+schedule+pdf PDF link annotation
- https://tungafilm.com/dorceiys/ckfinder/userfiles/files/1343807660.pdfIn PDF document text
- https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606fff397070e---30601601492.pdfIn PDF document text
- http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/e755b8be34d999480f2461d095df7301/17377799208.pdfIn PDF document text
- http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610beaab4ea19---24026018706.pdfIn PDF document text
- http://krevue.cz/UserFiles/File/39164956023.pdfIn PDF document text
- https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097408a9c343---59289888968.pdfIn PDF document text
- https://ddshower.com/ckfinder/userfiles/files/8420671258.pdfIn PDF document text
- http://harekatmemuru.com/images/Media/files/biruxajofopovuviwawenuj.pdfIn PDF document text
- https://kominove-centrum.cz/media/files/file/82875212201.pdfIn PDF document text
- https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/uob8a65i3f2t16ijeakcjurgo8/wabuxaloduv.pdfIn PDF document text
- http://inimtrento.it/userfiles/files/mivubimepiwaxenefazutetag.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4b858228b---99118749330.pdfIn PDF document text
- http://unsersohn.ch/images/file/zowizidutodemefagukaledo.pdfIn PDF document text
- https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/869073daa71304b4a688b98396b9d459/jibumesabugoxebejesoluvun.pdfIn PDF document text
- http://theclubburger.com/uploads/files/xakadurip.pdfIn PDF document text
- http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a1b05043b1a---pifepitubi.pdfIn PDF document text
- https://anukulagrotech.com/userfiles/file/musoduremitulat.pdfIn PDF document text
- http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609511992a02c---51568768090.pdfIn PDF document text
- http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0e90dc07b9---titojexa.pdfIn PDF document text
- http://aquamedia.cn/ckfinder/userfiles/files/fekedo.pdfIn PDF document text
- http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbdbf8fce9---50393179703.pdfIn PDF document text
- http://studioriggio.it/userfiles/files/1440996856.pdfIn PDF document text
- https://kodcomputers.ro/2664/uploads/miraz.pdfIn PDF document text
- https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/qjcu1ik5hav0npf6ecb10ndrru/50258982821.pdfIn PDF document text
- http://laptopplus.be/app/webroot/files/userfiles/files/42328450008.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_off0000c587.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC587	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000dd9e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDD9E	10468 bytes
SHA-256: `f81978bd24a4c1f9afc7accf8fb4e0627d8ead269d2f1660288640ad24df77e6`
`font_02_sfnt_off0000f5b5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF5B5	16128 bytes
SHA-256: `8e78a8d9b54c009d84aa37bd81593f0cd7c16b09437a27c7c7727cea08a5fb94`

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