PDF malware analysis — malicious · dc065a43c85a8680

MALICIOUS

PDF

89.4 KB Created: 2021-07-04 06:09:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14

MD5: 3f225f09245b41ff448ab8569c21d6ff SHA-1: bb1948c45ac230e61f980a03cb3e40570e543a03 SHA-256: dc065a43c85a86800cf1418a5c070816781e9719cb5a91ff80d60e22f0c06ff5

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The heuristics reveal a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting the PDF is used to distribute further malicious content. The presence of external URIs and a high number of distinct hosts indicate a broad distribution attempt, likely via spearphishing.

Machine Learning

Nyx PDF Classifier malicious score 0.9961

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://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/af3aefef3054eec536396e1e6795abcc/zexanavet.pdf In PDF document text
- http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160885395782c2---15659704550.pdfIn PDF document text
- https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ac3f269a703---25736701559.pdfIn PDF document text
- https://dalnoboy.com/data/filestorage/upload/files/89822712539.pdfIn PDF document text
- http://www.aluvascientific.com/UserFiles/file/78317509014.pdfIn PDF document text
- http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afdbb6e1e49---vevarikafazo.pdfIn PDF document text
- https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/mr9j9gfeo0clud36mlfvbqort0/55268717624.pdfIn PDF document text
- https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/372967105bfd2438ded034da64c0e0a8/mopijuvaropevujuvuw.pdfIn PDF document text
- http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/19814630245.pdfIn PDF document text
- https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3af8a80b4---jememuvajetubemibenizuvum.pdfIn PDF document text
- http://khiconghoixuancong.com/Khicong/admin/userfiles/file/buzagipurorofonosokufotep.pdfIn PDF document text
- https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/nr18fn09g5m5mhkk2508no44pq/47960509937.pdfIn PDF document text
- https://anmoul.com/userfiles/file/51041822416.pdfIn PDF document text
- https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/p10qnc5std4h3tr3p8lb6p65i6/31247954379.pdfIn PDF document text
- http://brookhavenclassof1967.com/clients/0/0c/0ca802fc87877f8c548ddf85495caeb2/File/pipave.pdfIn PDF document text
- http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/vc64r2re8co7mo50phcut9t1o0/49572420410.pdfIn PDF document text
- https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a41f5e9d95f---37532685184.pdfIn PDF document text
- http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16088babb99857---75529832658.pdfIn PDF document text
- http://aldo-ins.com/userfiles/file/95852908300.pdfIn PDF document text
- https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/10e34dc38f9fe8d0cc47fa9bb3c4acf5/wuzetijorumun.pdfIn PDF document text
- https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e03b15a6272---40151725023.pdfIn PDF document text
- https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/303o5sct4ja0e2amfff8i0bl0u/lazadikukimasifitilupefo.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=skeletal+and+muscular+system+worksheet+answersPDF 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_off0000fbdb.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFBDB	11008 bytes
SHA-256: `f0cb54146a5309caa9ff4d89beef2c014df6d3eeadf5f08c0e09315b2fb01363`
`font_01_sfnt_off00011562.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11562	16508 bytes
SHA-256: `39d85fe6547625eb1edb26dec8ab02795d0b52f0819a85b2b1f88c290457b88c`
`font_02_sfnt_off0001401e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1401E	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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