PDF malware analysis — malicious · 3f20c5237529d1e3

MALICIOUS

PDF

86.5 KB Created: 2021-07-15 13:14:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: 5c56c47be9be72dec58113107359ed4b SHA-1: 289117d3817792c54652e99408f3af8122eac36b SHA-256: 3f20c5237529d1e38a62315dfd1678992e7bb0c24492809050737ffee26a1179

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link

The sample is a PDF file identified as malicious by an ML classifier. It contains a large number of embedded URLs, many of which point to compromised WordPress sites. These URLs are likely intended to lure users into clicking them, potentially leading to phishing pages or further malware downloads. The presence of numerous links on disposable hosting and the use of UTM parameters suggest a coordinated effort to distribute malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9964

Heuristics 5

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://philabc.ru/uplcv?utm_term=fundamental+concepts+of+inorganic+chemistry+pdf PDF link annotation
- http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078682fd0da3---46440411073.pdfIn PDF document text
- http://hb1004.com/userData/board/file/51847854716.pdfIn PDF document text
- http://verduciautodemolizioni.it/userfiles/file/40031327379.pdfIn PDF document text
- https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/c4362519e181b2fea95079ce234921c2/53798066737.pdfIn PDF document text
- https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/84aed25887ab4cb409d6e121923bf5e7/57679576049.pdfIn PDF document text
- http://minuspk.ru/minuspk.ru/userfiles/file/wadobadipoj.pdfIn PDF document text
- http://www.vegagastro.pl/upload/file/pufifupupi.pdfIn PDF document text
- http://jiendurancecoaching.com/ckfinder/userfiles/files/zuzoxebamekiripobufum.pdfIn PDF document text
- https://invest.pl/userfiles/file/45316255173.pdfIn PDF document text
- http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/0d847f0f09269e5448f6bcc2b013d779/4666548059.pdfIn PDF document text
- https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae9c9868af3---16934945773.pdfIn PDF document text
- https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/bf1e709b2e156ef49a23f7df27750d56/jufodosisiwonawoj.pdfIn PDF document text
- https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/a66c4e653bf7c7a6fc1973e5aedf281f/vofepuzivevutatudipijun.pdfIn PDF document text
- https://dubaimotorcycletours.com/uploaded_images/files/vuxeponozofudapabi.pdfIn PDF document text
- http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b535f409e8b---wubotavonepiwiwizidug.pdfIn PDF document text
- http://lacasedescaraibes.fr/file/91497302202.pdfIn PDF document text
- https://ficsllc.com/wp-content/plugins/super-forms/uploads/php/files/vjpfai8gr505jkr1p32i9oof4j/77487537570.pdfIn PDF document text
- https://telenovella-bg.com/files/rawemadejekitunelonawisul.pdfIn PDF document text
- https://davidfauquemberg.com/home/fauquemb/david/bbdg_site/userfiles/file/rivebefedunipetod.pdfIn PDF document text
- https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/81abc7c6bf39d995bd67769e3773ca1f/11471410166.pdfIn PDF document text
- https://thietbivesinhanhhuy.com/asset/files/6275673520.pdfIn PDF document text
- https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/d393f0f8de6992d2018dde3a108d0727/kufokolafivedexulubenogu.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_off0000e740.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE740	11256 bytes
SHA-256: `532eec0dde1b6df5e24c37704d43ca7aac4bcc66ade19c244029c1d3fee47ae0`
`font_01_sfnt_off0001013f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1013F	19828 bytes
SHA-256: `4610cb863855348706b31c39dfb9918af289ef151acc1d15f6f731bbd0b00387`
`font_02_sfnt_off00013492.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13492	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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