PDF malware analysis — malicious · 021237b63b24b214

MALICIOUS

PDF

101.1 KB Created: 2021-07-29 10:34:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: 44398e658b7c7329bfb3fa7434bb697a SHA-1: 0f0ca5d2ddc9834607b63d67e4f3a27168d058e5 SHA-256: 021237b63b24b214f537fd8d58b0b7a5eb30ed61c0084d509fdf2e4b9dfc9f18

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm with numerous URLs pointing to various domains, many of which are hosted on compromised CMS uploads. ClamAV detected this file as Pdf.Phishing.Trojan, and an ML classifier also flagged it as malicious. The primary purpose appears to be redirecting users to potentially malicious sites, likely for phishing or malware delivery.

Machine Learning

Nyx PDF Classifier malicious score 0.9867

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 http://stratford1980.com/clients/1/19/19838be1bbe5684469623718d5e25b5d/File/30583546286.pdf In PDF document text
- http://beachfirebrands.com/userfiles/file/48546959361.pdfIn PDF document text
- http://wmc21.com/ckupload/files/44092407325.pdfIn PDF document text
- http://anipetkingdom.com/webroot/img/files/14468799145.pdfIn PDF document text
- https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160975ab7ccc60---9569913221.pdfIn PDF document text
- http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1d5f9d4e7---59017527416.pdfIn PDF document text
- https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/cp173v92v10sef93p9i4r6qcgg/xusaluzitivafinulase.pdfIn PDF document text
- http://thompsonhigh1980.com/clients/4/48/48b9e10b24f1ac3c627dfd5bb8c45987/File/90292152165.pdfIn PDF document text
- https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/hqpsa4nqcmjc350u4000de25eu/93533511298.pdfIn PDF document text
- https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/bd638c858a55ade4a0e9c4b4de5d98f2/94592006071.pdfIn PDF document text
- http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1607a403f91f04---midajodulabasexuro.pdfIn PDF document text
- https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/5d3fa57401ba46bb289ee2c342a64a6d/vibaximidimeketilotuwir.pdfIn PDF document text
- https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce8cd19cec2---wuwigagitubunonodugenev.pdfIn PDF document text
- https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/59b96d9c018122c111eac13315c760f8/pifenifazexazoretatuxun.pdfIn PDF document text
- https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160f6ab9f4ff8e---56025071177.pdfIn PDF document text
- http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160bb651be8f8e---fitojuresuwisipetobosova.pdfIn PDF document text
- https://domilot.com/uploader/files/8563868782.pdfIn PDF document text
- http://qtjdb.com/UploadFile/2021/05/24/file/20210524_230918_160.pdfIn PDF document text
- http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084851eb87ab---30383805478.pdfIn PDF document text
- https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/73ebe69638cc003c6b8d59902c85399a/lixuw.pdfIn PDF document text
- http://kaies.cn/upfiles/file/29809339432.pdfIn PDF document text
- https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a04816c8c10---duros.pdfIn PDF document text
- http://eau-msu.ru/ckfinder/userfiles/files/18237413541.pdfIn PDF document text
- http://mtjjt.com/2013/upload/article/files/21071916503736873014kc2.pdfIn PDF document text
- http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090d660e8499---62343444904.pdfIn PDF document text
- https://renesens21.com/ressources/upload/files/kuludefopunimow.pdfIn PDF document text
- https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/671ac190d46da09ea7847337af995214/sosoxade.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=are+mother+jeans+true+to+sizePDF 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_off000127b6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x127B6	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off00013fc8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13FC8	17868 bytes
SHA-256: `a2bee1f525bffe649f1dd5842eb665e3c1ecd5d3bdb75e3ce4f3d75516299bf3`
`font_02_sfnt_off00016e82.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x16E82	10600 bytes
SHA-256: `a9022d01d553c343efa742bf722861edd1c4a70ca8f90126d26fe771c10dfa41`

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