PDF malware analysis — malicious · c64f963d76440c71

MALICIOUS

PDF

75.8 KB Created: 2021-04-30 15:56:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07

MD5: 2b1f6c51130ad30bacff0ca7d7a0e5a6 SHA-1: f39bedead99d3aa46c58878676e1eaa260157032 SHA-256: c64f963d76440c71c4d92ce52d9c017540c3744cbc301a76abde4fbed5481732

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and does not provide clear textual lures.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

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://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160781cbf64d2e---zodanodulug.pdf In PDF document text
- http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/ed2f2f8e81a12fa73541522702e2d603/xifumos.pdfIn PDF document text
- http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8a0d87143---7009755307.pdfIn PDF document text
- https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/64d1fa63850e72176c272619664a07df/82175068071.pdfIn PDF document text
- https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e27e27dfac---46796753341.pdfIn PDF document text
- http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1607402a42a4bc---wikoxonevedik.pdfIn PDF document text
- https://www.lashharmony.co.uk/wp-content/plugins/super-forms/uploads/php/files/f5srfv39s9nls5dlio3n4mi50q/gavosibifodokojokojezinap.pdfIn PDF document text
- https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3f5d1631b---kazasuvapujedasipuz.pdfIn PDF document text
- http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/48f017c626b01d81a3c8a03d1cba6d09/86389958820.pdfIn PDF document text
- http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fce997a579---38175967794.pdfIn PDF document text
- https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/oogpuiprlghd5hj92t1c8r2gno/jazilokeraruv.pdfIn PDF document text
- https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/c87e63ccc8fc455a3892670a623d9c13/64912725467.pdfIn PDF document text
- https://traonguoc.vn/wp-content/plugins/super-forms/uploads/php/files/1i5trjlcueesp47gfkdnefdglg/1875648319.pdfIn PDF document text
- http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/vlgbtlot3crbl8m5t8052eucp7/jufanodojezodebo.pdfIn PDF document text
- https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085cdd8ea5b1---46830093612.pdfIn PDF document text
- https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160750f5e731c4---37838787717.pdfIn PDF document text
- https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/2f6122d00dce2f07b45367b2268d775c/10608509661.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- http://www.daltonmaag.com/In PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=anaconda+1997+hdPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000d492.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD492	4540 bytes
SHA-256: `da0035777a6a123fed0d6c4e2bddeff4fefa20f5992161651d03916800618685`
`font_01_sfnt_off0000e3e8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE3E8	20104 bytes
SHA-256: `63dce9575ac0a87d450fdb24bdb9df33f32f1376df24b3f2df7b6eeaccd42cb5`
`font_02_sfnt_off0001128d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1128D	4324 bytes
SHA-256: `1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361`

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