PDF malware analysis — malicious · 5038e83e2a370441

MALICIOUS

PDF

90.9 KB Created: 2021-06-29 18:53:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: cfe40ad292a8b7c83768171b2b37d367 SHA-1: 589534bf2e6909f1d52c1c078fcf46613cd4e4da SHA-256: 5038e83e2a3704410a9cccf36d75c5952d85e097ffd8aa96b3dc6390f96517fd

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The file's structure and numerous external URIs indicate it is likely used to deliver a second-stage payload or facilitate phishing attacks.

Machine Learning

Nyx PDF Classifier malicious score 0.9942

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://laborke.ru/uplcv?utm_term=need+to+be PDF link annotation
- https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/79cb6c91f22b5cc690f4794240dbc2c2/35406675780.pdfIn PDF document text
- http://karate-talence.com/newsite/userfiles/files/12313481482.pdfIn PDF document text
- https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/q0c6n0uq93bt6bdecl8gchkjnm/53179699008.pdfIn PDF document text
- https://www.letspassdriving.co.uk/wp-content/plugins/super-forms/uploads/php/files/u7hqsslaph4vam0chha5f1t1d3/88996911254.pdfIn PDF document text
- https://elminhaj.org/userfiles/file/7895387262.pdfIn PDF document text
- https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/499a0b1ca65c73ab04e0f56a1dbefe88/zigifubanejeligasawa.pdfIn PDF document text
- http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160d84df3e6374---61837076067.pdfIn PDF document text
- https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e242418f0e---60644702483.pdfIn PDF document text
- https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072b326d78c9---vulipejoguwisaragixezetom.pdfIn PDF document text
- http://rogo-rotterdam.nl/files/45223611084.pdfIn PDF document text
- http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f835c3f4b---78728454070.pdfIn PDF document text
- http://atdawnwelift.com/userfiles/file/46441039857.pdfIn PDF document text
- https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/iqp4bceuhejrf647135fh0vbk0/42467831364.pdfIn PDF document text
- https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/r7n79ktaijps8s2otr116rs4me/tosozitafikolusa.pdfIn PDF document text
- http://jucal.es/images/file/29475508649.pdfIn PDF document text
- http://geostudio.eu/userfiles/files/ziwejosalebunoki.pdfIn PDF document text
- https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/2510b9fb8d8f3edbb5e6d8aa7d1010ea/tivexiwasekoj.pdfIn PDF document text
- https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/ee46967248424275d543df7c5f29b387/ruwiwelodakiruneju.pdfIn PDF document text
- https://puppometalli.eu/file/3768789452.pdfIn PDF document text
- https://machinex-machines.com/UserFiles/File/58512951468.pdfIn PDF document text
- http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dac6198e48---nitopu.pdfIn PDF document text
- https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/ijm23nt782u59qeih5hvvibqeg/14126467337.pdfIn PDF document text
- https://opuntia.eu/wp-content/plugins/super-forms/uploads/php/files/514b65fe9ec01639fd03da3418702fd3/40111093320.pdfIn PDF document text
- http://anjilh.com/uploadfile/file///2021050219293061.pdfIn PDF document text
- http://bahattinburyan.com/userfiles/file/34133168940.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_off0000f5c9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF5C9	9688 bytes
SHA-256: `55c7f86b1c61a7e85f355dafd821c0d9868fdd5c3738aac9d13b5f7f7cbc29f3`
`font_01_sfnt_off00010af5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10AF5	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00012307.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12307	29324 bytes
SHA-256: `140eca68bfaa1438210a0503e5c81485bda57af8641f4af560979b6704c51ff8`

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