PDF malware analysis — malicious · c1a9f480195dfc8d

MALICIOUS

PDF

76.8 KB Created: 2021-09-02 09:35:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05

MD5: 92c1a327990fab1e5c192861bff43205 SHA-1: 4fbf02a691bf622cb8efbc2b0f997e689481d205 SHA-256: c1a9f480195dfc8d3cb49832ba1ca6686471e370984b0ebabaf9ca4c5aedd3c6

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a link farm with numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, likely intended to lure users to malicious sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9973

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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://inwebjor.ru/uplcv?utm_term=2016+owners+manual PDF link annotation
- http://thucphamchucnangmy.vn/uploads/files/93832353930.pdfIn PDF document text
- https://cambodiadriverservice.com/userfiles/file/87121149039.pdfIn PDF document text
- http://jnafarms.com/clients/864068/File/7572997579.pdfIn PDF document text
- http://alemotta.com/resources/original/file/natur.pdfIn PDF document text
- http://aircond.md/upload_fck/file/279569189.pdfIn PDF document text
- http://moskvaznaet.ru/upload/files/bufojumekebivepamokugazi.pdfIn PDF document text
- http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7e2922926---39088132407.pdfIn PDF document text
- https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/26e3129aab51176a941e4267e8268235/bijorolikimukanovobog.pdfIn PDF document text
- http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16071b01a3eafe---lesetikenavomafot.pdfIn PDF document text
- http://hasyo.net/files/file/67560151345.pdfIn PDF document text
- http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c684850053f---xodowosesolezibiwe.pdfIn PDF document text
- http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bfcfe6e5de5---wimudokanabi.pdfIn PDF document text
- http://americanewbie.com/userfiles/file/78212986749.pdfIn PDF document text
- http://doggystylzgrooming.com/admin/photos/file/dumowokizuriw.pdfIn PDF document text
- http://kingsfci.com/userfiles/file/19295136551.pdfIn PDF document text
- https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/159f113120b06c919cf2bf36bb8e4ca5/58678088799.pdfIn PDF document text
- https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/5317756487.pdfIn PDF document text
- https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/69fd4d0d6a20a4ce71bd96030969e394/26206923637.pdfIn PDF document text
- http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160cfe936cadbf---89772672747.pdfIn PDF document text
- https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088d1bc44639---6180623013.pdfIn PDF document text
- https://tradingphrases.net/userfiles/files/weboka.pdfIn PDF document text
- https://wittnebel.dk/file/kasatojapirigenagi.pdfIn PDF document text
- https://noticky.net/akce/fotky/file/bulixodumexuve.pdfIn PDF document text
- https://suma.ca/upload/editor/file/zojimemazuti.pdfIn PDF document text
- http://drive4smilesontario.ca/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/wefizunikifasagap.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_off0000c96f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC96F	16816 bytes
SHA-256: `b951997eeaca3048b445701568ddbf881c3b757b1009ee87c2f661076b638096`
`font_01_sfnt_off0000f4f0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF4F0	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00010d07.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10D07	10632 bytes
SHA-256: `369344bb27453e764b094b2764856a67c98291b32a5c26c99e75c51c9166e152`

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