PDF malware analysis — malicious · 8bd227073787d744

MALICIOUS

PDF

90.8 KB Created: 2021-07-07 01:34:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 44e693048c7e89eacbdf096c752d4959 SHA-1: ba37da2e14626366d88536d785ef0c3ce84fcde2 SHA-256: 8bd227073787d74433f9c4ec026b905d17bff8e7d5a68dac39303fa539a3e5e2

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites, likely intended to lure users into downloading further malware or submitting sensitive information. The document body is unreadable binary data, offering no direct content clues.

Machine Learning

Nyx PDF Classifier malicious score 0.9935

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://cructi.ru/uplcv?utm_term=parts+of+a+plant+cell+labeled PDF link annotation
- http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083b897d694d---wuxok.pdfIn PDF document text
- http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16090171065d2f---setaf.pdfIn PDF document text
- https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f26c2e6239---lanobewegusedowasotexudum.pdfIn PDF document text
- https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b20e2e4ea---ferujaviluxitowujebigewob.pdfIn PDF document text
- http://architettodrabeni.it/userfiles/files/97283678677.pdfIn PDF document text
- https://aprilboya.com/userfiles/file/35001303768.pdfIn PDF document text
- http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a051f7825c7---8452479897.pdfIn PDF document text
- https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/tr6s15k48d4n5pbl918406o8ee/4454514610.pdfIn PDF document text
- http://adabaskimerkezi.com/upload/file/rulusokavubitofalojabibi.pdfIn PDF document text
- http://briarcliff70.com/clients/874901/File/16628131205.pdfIn PDF document text
- http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9df2a93fa---netamajonedopasixir.pdfIn PDF document text
- https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f98f614d8---ruzekevaxugafivegifefupe.pdfIn PDF document text
- http://www.tobywells.org/media/fckdir/file/genuzewovegujomox.pdfIn PDF document text
- https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/tebjrspqqbc19ior96rmgsucqv/rogejewakozavisuli.pdfIn PDF document text
- http://fw-simple.com/uploads/files/15814585715.pdfIn PDF document text
- https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/5bg0cb69lmnim92lpbvfb0irdj/wojika.pdfIn PDF document text
- http://hk-sai.com/ckfinder/userfiles/files/lojifatakifovegofokuguda.pdfIn PDF document text
- http://xn--80aamdqpfpr.xn--p1ai/upload_picture/76380342931.pdfIn PDF document text
- https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/cf55hhm6kodk6fj8a6ql4apmer/60242682284.pdfIn PDF document text
- https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a91ec77d8c---lixobasofajawonegomogejiw.pdfIn PDF document text
- https://atlastoursntravels.com/userfiles/file/dejugameretod.pdfIn PDF document text
- http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607557e15911a---7987568893.pdfIn PDF document text
- https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/68c4f249c3810c0615fea68d96d97c06/tojodesagiwefepiwi.pdfIn PDF document text
- https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160928ee5bb5d7---dajerolovugif.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_off000102ca.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x102CA	10664 bytes
SHA-256: `e62dac18f2dc5f720d74b95b8c51c6f96191f17bea13361f01cde05098b26710`
`font_01_sfnt_off00011b22.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11B22	16484 bytes
SHA-256: `52f5d178e3c4d87f51027fbf382713c0a77d6e27e69509558085d5c7cae02ef9`
`font_02_sfnt_off000145e0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x145E0	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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