PDF malware analysis — malicious · 1cf42f72b4f8e712

MALICIOUS

PDF

84.6 KB Created: 2021-06-26 01:45:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23

MD5: 1c8668aeaec383ece507fac8b9f76237 SHA-1: 0aef5db548f0195f96fc6c4567909aae582b755d SHA-256: 1cf42f72b4f8e712ba98395e7108caa20382cf612e62ba76e77a92cd10a5dbbb

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which appear to be compromised WordPress installations used for hosting PDF files. The presence of a 'download button' heuristic further suggests a social engineering attempt to trick the user into downloading a payload.

Machine Learning

Nyx PDF Classifier malicious score 0.9860

Heuristics 7

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.
Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON

Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
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://medvor.ru/uplcv?utm_term=how+to+read+deleted+instagram+chats PDF link annotation
- https://verlauf-ekb.ru/admin/ckfinder/userfiles/files/fezozav.pdfIn PDF document text
- https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079917cd80c1---nafuwodetajug.pdfIn PDF document text
- https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/2q8f9iqg5pgub45a3fdd8fn4kr/76933534036.pdfIn PDF document text
- https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/13389273b28eac779def7ce6619ee545/8927959527.pdfIn PDF document text
- http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8aab4e611---2780139076.pdfIn PDF document text
- http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/i3vtono80e2p8366g1ie8l8hk3/18274819795.pdfIn PDF document text
- http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/0hkch8dies11uptbkilidfj71u/xalexamepedakadonuku.pdfIn PDF document text
- https://lecachet.fr/docs/files/gibugisu.pdfIn PDF document text
- https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/zuzagudonaninilimimuzeja.pdfIn PDF document text
- https://lawina-radom.pl/files/file/welitodepubijuroxugonenuk.pdfIn PDF document text
- https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c100aab3e7e---jorutugutakitemozadikim.pdfIn PDF document text
- https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/3d7bb29bc14f8c04dfbbbbada09a3a26/49630418019.pdfIn PDF document text
- http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba5f485a9ea---jekudozube.pdfIn PDF document text
- https://aawyx.com/sites/default/imageuser/file/7567715451.pdfIn PDF document text
- https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160b745f314870---37374164557.pdfIn PDF document text
- https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/36a8b2b1badc91def232ef34877f932d/kudonemalera.pdfIn PDF document text
- http://asianmosaicnyc.com/userfiles/file/38870729723.pdfIn PDF document text
- http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609833765169f---5389060619.pdfIn PDF document text
- http://thietkewebbacninh.com/webroot/img/files/kalinazuto.pdfIn PDF document text
- http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c930705fa5c---judurivamisarese.pdfIn PDF document text
- https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/707ac975ad60157131c5a7b6c170701e/rabodebevudafo.pdfIn PDF document text
- https://matrainagycsalados.hu/userfiles/file/nowaxutufefukopate.pdfIn PDF document text
- http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16076d2ba4387c---kanefor.pdfIn PDF document text
- http://gorisum.net/fckeditor/upload_file/file/lezomasifegeda.pdfIn PDF document text
- https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c40866b54---vinumuzitif.pdfIn PDF document text
- https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/njononc1qu7mfj71grb3bf1u95/43667875034.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_off0000e729.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE729	10896 bytes
SHA-256: `686baf83689537c1d97f47f4d646b6583be374a2c4f1fbe9f1ac618806a26a4d`
`font_01_sfnt_off0000ffed.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFFED	17260 bytes
SHA-256: `618e7fde02531d9da74b74ba6f0d0cd7ad53eabf6fd1213c4e35b74f57ef1315`
`font_02_sfnt_off00012d00.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12D00	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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