PDF malware analysis — malicious · 6166355f1ed8a689

MALICIOUS

PDF

85.1 KB Created: 2021-06-26 01:06:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25

MD5: 8e7d30f9924af9697320b5a6b89b9513 SHA-1: 022981c6eb720f30e9f8c64bdbd99228d0296042 SHA-256: 6166355f1ed8a689e98b1a745c5ac26110a547fc59e7688d83a9f79a9f40afa0

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with multiple URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to obscure the final destination. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a phishing or redirection scheme.

Machine Learning

Nyx PDF Classifier malicious score 0.9951

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://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/80fp2rup8lh8ia25eu8r9vuouo/gufuruxezumotagigagike.pdf In PDF document text
- https://liderpin.com/calisma2/files/uploads/48657169108.pdfIn PDF document text
- https://anfauglir.com/images/file/63115604734.pdfIn PDF document text
- https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/74218bd764a71923c1203534b54e98f8/94468774012.pdfIn PDF document text
- https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/3828355ad6b9233943921be78cff1aab/44564950227.pdfIn PDF document text
- http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a31d86ee903---4997150715.pdfIn PDF document text
- https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/963273e6e0439a42baa39ec66e84503a/lopapo.pdfIn PDF document text
- http://gocreate.termall.pl/upload/fck/file/xerozabe.pdfIn PDF document text
- https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/jigulafegilinam.pdfIn PDF document text
- http://taiwan-casters.com/userfiles/file/bewemo.pdfIn PDF document text
- http://shriadinathbank.com/uploads/50192516908.pdfIn PDF document text
- https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608756bf57222---gosenaxumesesip.pdfIn PDF document text
- http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f8678e5d7---dofuniginimigezedidini.pdfIn PDF document text
- http://ats-dz.com/userfiles/file/30579454730.pdfIn PDF document text
- https://aawyx.com/sites/default/imageuser/file/sidivagitim.pdfIn PDF document text
- https://acryl-bg.com/userfiles/file/gaxupibugiwojaxubafuka.pdfIn PDF document text
- https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/4f8ccddff5d4ca8d54d8a8021dc535bb/59602702379.pdfIn PDF document text
- http://alakharia.com/public_html/userfiles/file/43016667268.pdfIn PDF document text
- https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/c7d697cc062888001cd3610577768c72/jorewinerabiwaxomabiteviw.pdfIn PDF document text
- https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/fbd747040ffa6aabf30e848a892161bc/11075597556.pdfIn PDF document text
- http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607de3f4001b4---boladeguj.pdfIn PDF document text
- http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077dc9073287---sukelabaduvopafefukukokav.pdfIn PDF document text
- https://zop.bg/webroot/img/content/files/61644730314.pdfIn PDF document text
- https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608485da771bd---54942504525.pdfIn PDF document text
- http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16080bc3617893---95932737135.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=feasibility+in+researchPDF 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_off0000eac1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEAC1	17104 bytes
SHA-256: `24675c23ecb998669e211b0b983e7a3c9c08a1accdde7595e69df2e36d83e733`
`font_01_sfnt_off00011795.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11795	10436 bytes
SHA-256: `938dfc722078d22e9e2f98080a9061025db7eea4ce14776be4352af8ac89e918`
`font_02_sfnt_off00012f39.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12F39	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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