PDF malware analysis — malicious · 4e579362b03de42d

MALICIOUS

PDF

88.2 KB Created: 2021-09-08 01:00:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07

MD5: c78e431ef65e458d77d34d61d9060135 SHA-1: 20174f8b53b09dacaf6cdee22142446f50db352f SHA-256: 4e579362b03de42d3cc29fbb6551e322f7884abcabde8c1f3170e2a5cca7331b

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was identified as malicious by a machine learning classifier and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs that point to compromised CMS upload directories. These links likely lead to further malicious content or phishing pages, indicating a multi-stage attack. The presence of multiple distinct hosts and the use of 'utm_term' parameters suggest an attempt to obscure the true malicious destination.

Machine Learning

Nyx PDF Classifier malicious score 0.9905

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://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/jdhi4pef5v2o3b1ou9vudd2l51/totigulivavaretototukizu.pdf In PDF document text
- https://trellisdundee.com/wp-content/plugins/super-forms/uploads/php/files/d7d6416912e1632632ddd8c2c50ea6e4/90687387539.pdfIn PDF document text
- https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/cd9331846ac3bc2f04ed35da90a305ef/72974391876.pdfIn PDF document text
- https://bwawarszawa.pl/upload/file/sakuvenekolured.pdfIn PDF document text
- https://le27.fr/docs/file/76758748723.pdfIn PDF document text
- https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/1c902ccd7b0f0d4e75059e3e6b334176/jevegemagodafezeno.pdfIn PDF document text
- https://petala.gr/userfiles/file/jafasiburemurejugo.pdfIn PDF document text
- https://windsbs.biz/files/file/vowobo.pdfIn PDF document text
- http://paradisetourkorea.com/FileData/ckfinder/files/20210618_D972951D44B61A50.pdfIn PDF document text
- https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a74ae96bfce---munotewuvupefovonekunipo.pdfIn PDF document text
- https://www.jaegeraviation.com/ckfinder/userfiles/files/rowurulovukikisizesi.pdfIn PDF document text
- http://simkoongschool.com/uploads/editer/files/pavalipifugevivukigefeb.pdfIn PDF document text
- http://dzwigipoznan.pl/userfiles/file/bisovo.pdfIn PDF document text
- http://samuiluxurytravel.com/Uploads/file/papeperivexelokubijene.pdfIn PDF document text
- http://pospatrans.cz/UserFiles/File/nibalamufojas.pdfIn PDF document text
- https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e951c2564d8---53499250654.pdfIn PDF document text
- http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609c5f49475f0---zofabofal.pdfIn PDF document text
- http://malbreil.com/userfiles/file/nanufenogujibojopir.pdfIn PDF document text
- http://iberryhomemade.com/userfiles/files/28735491825.pdfIn PDF document text
- http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a85eed35682---59277158133.pdfIn PDF document text
- https://terminal.hr/userfiles/file/xenatum.pdfIn PDF document text
- https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/e3d7a996ad8f0357ff41e667bec073c7/40223191827.pdfIn PDF document text
- http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16079d9aa95919---56625037849.pdfIn PDF document text
- http://lynxitservices.com/ckfinder/userfiles/files/tojabatuv.pdfIn PDF document text
- https://baobihungphu.com/media/ftp/file/wusiwajewinirogenurure.pdfIn PDF document text
- http://cherryontop.pl/upload/fotki/file/31450072337.pdfIn PDF document text
- https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/c399d6d22052fbc35ca4161f43ee5433/xegasu.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=probability+and+statistics+for+computer+scientists+solutions+pdfPDF 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_off0000eefb.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEEFB	18900 bytes
SHA-256: `1e501ea83ab57570c09652fdc60a0ad913beb44027ad9994d9a9ea2662566b1b`
`font_01_sfnt_off0001202e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1202E	11136 bytes
SHA-256: `10775ec0dc926c19b9ba352c25dc57b0803c934943b1e1494d09846f4794799c`
`font_02_sfnt_off000139fb.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x139FB	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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