PDF malware analysis — malicious · b24a94c48411fa43

MALICIOUS

PDF

71.0 KB Created: 2021-09-28 07:53:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: 75385cc5da1fb27dfe2f8e93f5ac1911 SHA-1: f5c657074eb89eedb6c7bed65b861c16de8fb90f SHA-256: b24a94c48411fa431ae9463b3dbd4fac569a41aa10f7bfc3db303dcdbe962b12

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to potentially harmful content. The presence of embedded URLs and the overall structure strongly suggest it's used as a lure, likely for phishing or to download further malware, aligning with spearphishing attachment tactics.

Machine Learning

Nyx PDF Classifier malicious score 0.9975

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://queure.ru/uplcv?utm_term=grand+theft+auto+vice+city+game+apk+download PDF link annotation
- http://eptesteplelek.com/uploads/file/77165830619.pdfIn PDF document text
- http://kursadowicz.pl/Upload/file/94823577322.pdfIn PDF document text
- http://balmybnb.com/t/tutorfirm/uploads/ck/files/96444776569.pdfIn PDF document text
- http://kxqcgs.net/filespath/files/20210924224304.pdfIn PDF document text
- https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/a05bff0fc0e108de2309aef06702099c/59043939694.pdfIn PDF document text
- https://searches.onlineconvey.com/userfiles/file/depataxinijejuguzojeja.pdfIn PDF document text
- http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161437b28e3114---fifedogufewopak.pdfIn PDF document text
- https://38e5bbdfe8be.gdziezjesc.info/userfiles/file/11662920741.pdfIn PDF document text
- http://wjcopy.com/upload/files/8054111381.pdfIn PDF document text
- https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/695b4751993b96275b1108b897e57bd2/95106249737.pdfIn PDF document text
- https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16132f354d98a1---86445776699.pdfIn PDF document text
- http://www.coverseg.com/uploads/ckfinder/files/9892981598.pdfIn PDF document text
- http://saopauloairporttransfers.com/ckfinder/userfiles/files/tegeku.pdfIn PDF document text
- https://fleschimmo.lu/userfiles/files/82732424351.pdfIn PDF document text
- http://tythb.com/uploadfile/files/pularezomowefoj.pdfIn PDF document text
- https://cristalensi.com/public/File/kilofiwetepujimozes.pdfIn PDF document text
- http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b309449c3d---liwamaru.pdfIn PDF document text
- http://www.veslovani-vsb.cz/soubory/file/90039448595.pdfIn PDF document text
- https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/bslut3m4a0k11a65ds9tk090n2/mavizezeribirabofu.pdfIn PDF document text
- http://www.gulbaharsigorta.com/contentData/file/6081880344.pdfIn PDF document text
- https://ltes2.tw-goods.com/UserFiles/files/17758975456.pdfIn PDF document text
- https://ita.kru.ac.th/ckfinder/userfiles/files/xotavife.pdfIn PDF document text
- http://secohthailand.com/file_media/file_image/file/kaxowolekinemunivi.pdfIn PDF document text
- http://uhorder.com/upload/files/bemoda.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_off0000b3dd.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB3DD	15588 bytes
SHA-256: `bed7c5c22e451fde8a4c2d826615da661bec4b120e0f5e10e9a90a5582c8f311`
`font_01_sfnt_off0000daf9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDAF9	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000f310.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF310	11396 bytes
SHA-256: `593d3bef66d36bb5494a5c4caa027151d16b9ad30b9943dcba4ad67ddb6d99b1`

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