PDF malware analysis — malicious · d72ad61283b46424

MALICIOUS

PDF

90.0 KB Created: 2021-06-29 08:08:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)

MD5: 1941a524e2ad20eebd98825b60f541ef SHA-1: 013038d08700708148ebbf46b9212f08bb8df403 SHA-256: d72ad61283b46424102924a09bd52ff1026cd297b67895eee76469f76d45c5b6

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was flagged by ClamAV as a phishing trojan and by an ML classifier, indicating malicious intent. It contains a visual download button and numerous links, many pointing to other PDFs hosted on compromised or disposable domains, suggesting a link farm designed to distribute malware. The presence of multiple external URIs and a link farm heuristic strongly supports a phishing or malware distribution attack pattern.

Machine Learning

Nyx PDF Classifier malicious score 0.9985

Heuristics 7

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.
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://asustainable.com/global/file/58133631795.pdf
- https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/16086d4c31c71e---77435626739.pdf
- https://atraba-holding.com/userfiles/file/5455867868.pdf
- http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/160763d1147026---fegajopepesipo.pdf
- http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160809a6e596df---lanozupejoximibegirul.pdf
- https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/67c17f132d8373a63731711a7b7ffac3/33660603021.pdf
- https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/7b8d6681afc4dee09919d1ce063bd715/4853690108.pdf
- https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/a8cae03026b5693c4461dbed80fd2c23/47503912574.pdf
- http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609959998a0b9---zamatezafowax.pdf
- http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075b3d7ebe65---32374233167.pdf
- https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/e12e486ab010729a1c78cd3c80ec2d38/kuzutis.pdf
- https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/661f7a02c733ae0af7d007a15581e84f/pojixibakezepukela.pdf
- https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/9c889a3fb51a47f97ce12662e1dc77e0/76795256799.pdf
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=need+for+speed+pc+game+download+apk
- http://www.w3.org/1999/02/22-rdf-syntax-ns#
- http://purl.org/dc/elements/1.1/
- http://ns.adobe.com/pdf/1.3/
- http://ns.adobe.com/xap/1.0/
- http://ns.adobe.com/xap/1.0/mm/
- http://ns.adobe.com/xap/1.0/rights/
- http://dejavu.sourceforge.net
- http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000e4c6.bin` `8f95f5e5268ffbfba3a879144e09bbc21c2f1455e1c6b4f003c2a3d1e010374a`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE4C6	17396 bytes
`font_01_sfnt_off00011211.bin` `9f6cc7c3cf1b399cdd38028698233649071c52cab10be8fbb3c2ee5844e53902`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11211	10928 bytes
`font_02_sfnt_off00012b3e.bin` `72b6d5534888ecec27fd68dccf88827b5fbc3510db23809d90398b76a33fedee`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12B3E	16304 bytes
`font_03_sfnt_off00014132.bin` `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14132	16792 bytes

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