PDF malware analysis — malicious · 5a83a9437ee25e07

MALICIOUS

PDF

76.1 KB Created: 2021-09-15 00:18:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: a38eb27c84c8546dd17efc79967a9e3f SHA-1: 05d57be287f9363aca504af57b1ece83efc92cd0 SHA-256: 5a83a9437ee25e07a9c2effa3f9ca7f891297c711c894c030ac6d4446de17d21

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm used for phishing or malware distribution. The PDF structure and embedded links are consistent with a spearphishing attachment attack vector.

Machine Learning

Nyx PDF Classifier malicious score 0.9973

Heuristics 6

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.
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://garglob.ru/uplcv?utm_term=react+design+system PDF link annotation
- http://www.veslovani-vsb.cz/soubory/file/bemixe.pdfIn PDF document text
- https://pastijptoto.com/contents/files/juguweraxatofevadunejur.pdfIn PDF document text
- https://jmbarrenetxea.soinuenea.eus/files/galeria/files/nasimas.pdfIn PDF document text
- http://miydz.com/mingyi/images/userfiles/file/70046234753.pdfIn PDF document text
- http://sherwoodonionfestival.com/ckfinder/userfiles/files/tabuvupetapejaxu.pdfIn PDF document text
- https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131f40188c4e---dowumodutapajatol.pdfIn PDF document text
- https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/17f7efbd0be83f3f7afa2595a46f2b53/8675776656.pdfIn PDF document text
- https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/161410e5a3a3ae---94371670357.pdfIn PDF document text
- http://cokhitienvuong.com/uploads/files/20508614247.pdfIn PDF document text
- https://dursunguney.com/userfiles/files/29245817142.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161411003ea1de---kowuma.pdfIn PDF document text
- http://xn--e42bt3l.net/upfile/files/rajipex.pdfIn PDF document text
- https://praktijk-fix.nl/userfiles/image/file/luwiwu.pdfIn PDF document text
- http://caudafotografia.com/userfiles/files/luwanoxepibefusom.pdfIn PDF document text
- http://hanmih.com/userfiles/file/20210907023556.pdfIn PDF document text
- http://leadershipcareer.kr/fckeditor/_upload/file/zulufe.pdfIn PDF document text
- https://www.meditech.cz/ckfinder/userfiles/files/995331085.pdfIn PDF document text
- http://gmicropilotes.com/uploads/files/8980134235.pdfIn PDF document text
- http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/16141074f785ca---69809948554.pdfIn PDF document text
- http://studiotipaldo.com/userfiles/files/44537412821.pdfIn PDF document text
- https://pastravariaizvoarelebratiei.ro/images/file/bosufazetodinogowajaxer.pdfIn PDF document text
- http://cafegreenwichvillage.com/uploads/files/21498483491.pdfIn PDF document text
- https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/1036951d10d0c3ec9ef3e57bd1760d52/32866804462.pdfIn PDF document text
- http://chunmianxian.com/upfolder/e/files/20210909061030.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_off0000c571.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC571	17368 bytes
SHA-256: `d0752b83313621f8007c4c17edc954a3e597241bd8cf0f3609089721506eca21`
`font_01_sfnt_off0000f25c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF25C	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00010a73.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10A73	10608 bytes
SHA-256: `0c131d0ea6ffe838212f5beeb9e77f804c9a5751a4a27226aa0ccc1f471a6017`

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