PDF malware analysis — malicious · b8df007aa01dfc51

MALICIOUS

PDF

82.2 KB Created: 2021-09-06 16:01:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: e1dbec1a6934cc4bcd6b0a8cb4851624 SHA-1: eb14d5b40519abe3c9a97997cd82d5195a3a24cc SHA-256: b8df007aa01dfc511af750a04de5ea6286eea919f9571f88a6582b63c9b30669

192 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous links to compromised WordPress upload directories and other disposable hosting sites, likely to distribute further malicious content or phish users. The presence of urgency and download button lures further supports a phishing or social engineering attack pattern.

Machine Learning

Nyx PDF Classifier malicious score 0.9981

Heuristics 9

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.
Callback phishing phone lure medium SE_CALLBACK_LURE

Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
Urgency / deadline lure low SE_URGENCY_LURE

Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON

Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
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://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/4d58nlkocssj2g9ugn2adm74j6/87541807927.pdf In PDF document text
- https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/68vemc12s51ke4dsssd0vllvvi/bapozisazuzeniniku.pdfIn PDF document text
- http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160771f98f14e7---rebuxixokekasupawegujune.pdfIn PDF document text
- https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/52289d93827561e2b08c4f8c10c0435c/22804397093.pdfIn PDF document text
- https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160772835daca1---teboxulalodizavejasu.pdfIn PDF document text
- https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa163642948---loremiv.pdfIn PDF document text
- https://betalinktech.com/blmedia/file/73870058754.pdfIn PDF document text
- http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1607ecb5522301---4490151325.pdfIn PDF document text
- http://namjapizza.com/app/webroot/files/vurulesavefuwelokok.pdfIn PDF document text
- https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/9a079a88f2d22600f754c8b6f1606a34/86595872842.pdfIn PDF document text
- http://mldinsaat.com/image/files/45764089046.pdfIn PDF document text
- https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/f938e532a504ed6ad495bd0986f3f5bf/liwiminexarilutivu.pdfIn PDF document text
- https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a9dfd565da0---7294113108.pdfIn PDF document text
- https://smallislandcurry.com/wp-content/plugins/super-forms/uploads/php/files/adf51254d1126c0b9e3a7dd286b77665/bezurenetewumijosotonik.pdfIn PDF document text
- https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/902ef6aa0f018d69fbe73006e806ccc0/93529679651.pdfIn PDF document text
- http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c55d42b045---93410019222.pdfIn PDF document text
- https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f991bd2d128---suviv.pdfIn PDF document text
- https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a71e308c341---63338016723.pdfIn PDF document text
- http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/aumvlc7r1vls7sogoa0g04hrb5/83701758990.pdfIn PDF document text
- https://baoholaodong24.com/userfiles/file/ladaxa.pdfIn PDF document text
- http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b9476456849---medomag.pdfIn PDF document text
- http://zaun-produzent.de/userfiles/file/51465624328.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=bpsc+mains+lsw+question+paper+2018+pdfPDF 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_off0000d5b0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD5B0	18812 bytes
SHA-256: `ca8140047c5ce319443245be3ff9f023b776dca912fc0d702362f2c4b04b0626`
`font_01_sfnt_off0001071c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1071C	11668 bytes
SHA-256: `462c29e9d61fc9715cb340928fee667f75aca38884f9bdf78012dca416bf94e1`
`font_02_sfnt_off000122dd.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x122DD	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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