PDF malware analysis — malicious · 40470acbe70dc063

MALICIOUS

PDF

80.7 KB Created: 2021-09-02 13:31:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 12667d15c82fe883002268727d6b1169 SHA-1: 0c588e49d49e4029c63b7798dd9911474a231cbb SHA-256: 40470acbe70dc06354760cd9ecb43b98beb4611bb9ca753d0b85f094a2b08d3c

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. It contains numerous external URIs pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and the nature of the heuristics indicate a phishing or malware distribution attempt, likely initiated via a spearphishing attachment.

Machine Learning

Nyx PDF Classifier malicious score 0.9949

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://queure.ru/uplcv?utm_term=escuela+positivista+historia+pdf PDF link annotation
- https://kasihpaham.com/contents//files/borefesagikewibugefum.pdfIn PDF document text
- https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a40bec623a4---xisokorikunupalatun.pdfIn PDF document text
- https://sportsht.com/userfiles/file/47789244676.pdfIn PDF document text
- http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/gqqng7tqjncop4bv9n68i7otv6/72404842805.pdfIn PDF document text
- http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094539fe3be9---60503243771.pdfIn PDF document text
- http://twozonechickenlasvegas.com/uploads/files/vaxulepoledebitafole.pdfIn PDF document text
- http://techcessgroups.com/userfiles/file/lolununiliropisogopemuxor.pdfIn PDF document text
- http://skonasystems.com/userfiles/file/madobimeve.pdfIn PDF document text
- https://trimix.bg/UserFiles/File/30670355793.pdfIn PDF document text
- http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/9717585308.pdfIn PDF document text
- http://rutherford58.com/clients/5/5b/5b2824e44de76337c32dfcbc3ee6dba3/File/legatozetopemutob.pdfIn PDF document text
- http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da795ad4cb0---7240500384.pdfIn PDF document text
- https://openkomm.yussfone-crm.com/userfiles/file/nisebukasapijud.pdfIn PDF document text
- https://securitydm.rs/slicice/file/45093046566.pdfIn PDF document text
- http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc5ac198e1---28418746265.pdfIn PDF document text
- https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/7aece0b6e46b2a89f7b044abebcc3345/69513370742.pdfIn PDF document text
- https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/de72c5a3c05a466a5dce626dafca15f5/5575659886.pdfIn PDF document text
- http://chiesamadremarsala.eu/userfiles/files/54207392724.pdfIn PDF document text
- http://neonatal-surgery.ru/userfiles/files/pekudibu.pdfIn PDF document text
- https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16082d87490feb---pudisebutafejodosob.pdfIn PDF document text
- https://termoformat.md/img/files/12715242100.pdfIn PDF document text
- https://uniontend.com/userfiles/files/43019667276.pdfIn PDF document text
- https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/btc71co1op0vn96c5q9ch4apsi/21420461583.pdfIn PDF document text
- http://bluebirdcanada.com/FileData/ckfinder/files/20210809_FB14F788533A316D.pdfIn PDF document text
- http://floral-design-lindgens.de/userfiles/file/88909170709.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_off0000d29f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD29F	19596 bytes
SHA-256: `4c50f0ab6c649f644a33b91e219d9ef5ddd4a1198c786607ede242f0cf657dea`
`font_01_sfnt_off00010417.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10417	10764 bytes
SHA-256: `911573d62884bb9cd40f5f81bb23db3dbb2583385ce08cfa615258734d88329b`
`font_02_sfnt_off00011d04.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11D04	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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