PDF malware analysis — malicious · 97b5546a5d7a0a8f

MALICIOUS

PDF

84.2 KB Created: 2021-09-02 18:03:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: 7e1361fcd2ba1b1d7924c1763da3b99c SHA-1: 2c98aa7b9da253430ae2dd8eb9f8224222f0d38f SHA-256: 97b5546a5d7a0a8ff70fcb3c07c70dd4fd52dabe7ea8f5aed5fd4fd6055015ec

176 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF document contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The heuristic 'SE_CALLBACK_LURE' indicates the document may be designed to trick users into calling a phone number for fraudulent purposes. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or scamming operations.

Machine Learning

Nyx PDF Classifier malicious score 0.9911

Heuristics 7

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.
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://rajaunited.com/contents//files/5214002698.pdf In PDF document text
- https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161113c1be87c1---rozojam.pdfIn PDF document text
- http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6fa7e3313f---dikonu.pdfIn PDF document text
- http://obchodsezlatem.cz/upload/files/54824684499.pdfIn PDF document text
- http://turystyka.powiatlubartowski.pl/admin/ckfinder/userfiles/files/baxiv.pdfIn PDF document text
- http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/86844776312.pdfIn PDF document text
- https://diedacorporation.net/freesiafiles/file/1185508017.pdfIn PDF document text
- https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608580ff7099a---xejiwawefibodigabebikus.pdfIn PDF document text
- https://ichibaninfotech.com/ckfinder/userfiles/files/1858262522.pdfIn PDF document text
- https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c31b900e250---63368250606.pdfIn PDF document text
- https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/4em5f9oljnikrsanvvhcbeielm/japirozepifopopogu.pdfIn PDF document text
- http://ahxxzx.com/userfiles/202106/file/31444833604.pdfIn PDF document text
- http://thingsantiquesla.com/userfiles/files/monobilek.pdfIn PDF document text
- http://loscogliodifavignana.it/userfiles/files/22213431746.pdfIn PDF document text
- http://lbtech.kr/upfile/files/73273670410.pdfIn PDF document text
- http://helloshoppingnepal.com/userfiles/file/40710792.pdfIn PDF document text
- https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/17a28757195720c0dc19c229167758b4/remugegokatilapevas.pdfIn PDF document text
- http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/0aa02180a98bda783721d97995e87941/37673885197.pdfIn PDF document text
- http://luckdidea.com/ckfinder/images_store/files/bibasariradotot.pdfIn PDF document text
- https://vietucmould.com/img-vietuc/files/xanukegoxewod.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080dfbfa5d8e---defutafezam.pdfIn PDF document text
- http://stavebnevyrobky.sk/www/upload/files/mupekevoganapugo.pdfIn PDF document text
- https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b462737c2da---38984330200.pdfIn PDF document text
- https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/16093a4289a5e4---2946634433.pdfIn PDF document text
- http://k1a.ru/images/files/file/vekudiluzixuwovino.pdfIn PDF document text
- http://czerwoneiczarne.pl/files/file/28575167380.pdfIn PDF document text
- https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608855fe1dc52---selawubizinosunowim.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=grade+3+maths+test+worksheetsPDF 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_off0000e5f1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE5F1	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000fe08.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFE08	10660 bytes
SHA-256: `fd173263fc0e76db5f5972e672fffea6bf3c8b44626f68b50090f607ef3c64d1`
`font_02_sfnt_off000116a1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x116A1	17156 bytes
SHA-256: `9e8239de85e373a659ac3e4b98f55a9b6600acc1f58d4b2b14ed39ce5e5a5049`

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