PDF malware analysis — malicious · 10333379b2c3fdf5

MALICIOUS

PDF

76.1 KB Created: 2021-09-02 18:45:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: c475109fee889071c7140e71b7874bdc SHA-1: d5a93043e74df425227fe644bf237b4762f41aa8 SHA-256: 10333379b2c3fdf5870bcdb71ae6ae3217cbed363c1cb5211d34f7ae445546ed

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to multiple compromised websites and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is unreadable, but the heuristics and URLs clearly indicate a malicious link aggregation strategy.

Machine Learning

Nyx PDF Classifier malicious score 0.9993

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://amatnieks.com/pictures/image/kexulomebejatixolu.pdf In PDF document text
- http://anhuishangbiao.com/upload_fck/file/2021-4-29/20210429190916125097.pdfIn PDF document text
- https://www.avantagesapp.com/uploads/files/71848251982.pdfIn PDF document text
- https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/7f792e96175f4dbc6959817498f40a62/17355832597.pdfIn PDF document text
- http://kyea.org/imageuploads/78799919760.pdfIn PDF document text
- https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16080c26194ea5---37770788349.pdfIn PDF document text
- https://detectiveoffice.net/userfiles/file/40016321270.pdfIn PDF document text
- http://heyumpnd.com/userfiles/file///35562000091.pdfIn PDF document text
- http://yves-segers.be/userfiles/files/dulotoj.pdfIn PDF document text
- http://52fotki.ru/ckfinder/userfiles/files/wuwavuvivuwogigevivap.pdfIn PDF document text
- http://norilskgu.ru/userfiles/file/defidomafal.pdfIn PDF document text
- http://massimosusto.eu/userfiles/files/momasobuzox.pdfIn PDF document text
- http://glastergroup.ru/userfiles/file/71042697042.pdfIn PDF document text
- http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1608deada106b6---felegajelotevuvafaxuwujiv.pdfIn PDF document text
- http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/dvvp2lg1rtcrt9p1k4k7nnsg35/pejagimudosufi.pdfIn PDF document text
- https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/03l143bdcqhjufjk5ssoq365at/vagawokexemakamedobogifaz.pdfIn PDF document text
- https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/3e033454af8d0e3fbf39359b3a3311c6/98764849435.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=pang+uring+panlarawan+at+pamilang+worksheet+grade+1PDF 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_off0000c56f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC56F	11168 bytes
SHA-256: `764224a749366e096542ea25822bbacf4ce6a192bd361f791fb0ea0dfafa1d7a`
`font_01_sfnt_off0000df3d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDF3D	17012 bytes
SHA-256: `7d3cf206e302cb3d7a8c1c23b190124f1bcbc5166c8da93a2272c298b2ae6db6`
`font_02_sfnt_off00010b43.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10B43	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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