PDF malware analysis — malicious · ec19c9ed191dd4aa

MALICIOUS

PDF

67.9 KB Created: 2021-09-28 00:43:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 1cc76ebe15d38b451f71641008f71b92 SHA-1: e6dd6879b4066415a0f1183ed2bb69decd7b09d5 SHA-256: ec19c9ed191dd4aa86a9a2567062b5831f26872791780e5108af50bd01f0e9ec

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to potentially compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure indicate an attempt to lure users to external, untrusted sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9968

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 http://dokturmice.com/ckfinder/userfiles/files/60856753251.pdf In PDF document text
- http://ed-union05.ru/files/file/39836344032.pdfIn PDF document text
- http://rlponder.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/29995188526.pdfIn PDF document text
- http://cobmedia.hu/include/10071709281.pdfIn PDF document text
- https://podiummagazinenews.com/ckfinder/userfiles/files/90900445496.pdfIn PDF document text
- http://diencongnghiepvohoang.com/uploads/files/93305194523.pdfIn PDF document text
- http://grossbuch.com/upload/file/60591331718.pdfIn PDF document text
- http://atut-biuro.com/uploaded/file/kuvufovupuxorovanu.pdfIn PDF document text
- https://honghow.com/ckfinder/userfiles/files/99279225177.pdfIn PDF document text
- http://cosmoscm.com/contents/files/55123276358.pdfIn PDF document text
- https://www.mediawerf.nl/bundles/store24backoffice/ckfinder/userfiles/files/76756723318.pdfIn PDF document text
- http://bjerkelunden.org/content/files/userfiles/file///favosuwagejogimak.pdfIn PDF document text
- http://magendans.com/imagefiles/file/wosasazigejokufepevovo.pdfIn PDF document text
- https://sdhouse.info/ckfinder/userfiles/files/39800015653.pdfIn PDF document text
- http://idrogastermoclima.it/Utentifile/FCKPage/file/61690865668.pdfIn PDF document text
- http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16151a06f1f130---kofolisisavojeremoju.pdfIn PDF document text
- https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/161380a3928994---rapefikujubefir.pdfIn PDF document text
- http://dorp.pl/userfiles/files/94229122373.pdfIn PDF document text
- http://studiodrago.eu/userfiles/files/17120449083.pdfIn PDF document text
- https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/ijjkntias9qg40n8mnp7gu288t/gusoduxodezajetip.pdfIn PDF document text
- http://denda.co.kr/ckfinder/userfiles/files/18790783250.pdfIn PDF document text
- https://helicopterleasingservices.com/userfiles/files/71523326522.pdfIn PDF document text
- https://festivaldelmaridaje.com/sgi_userfiles/userfiles/files/79844887284.pdfIn PDF document text
- https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/082fb2eed17ab04d724f204a4748e481/likotaliwojodoxez.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=hak+aplikacija+za+android+downloadPDF 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_off0000ae8d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xAE8D	10468 bytes
SHA-256: `08225961d6b675e085af2fc81d2eef209944648d2657e2bbc3903cf5c94ca829`
`font_01_sfnt_off0000c65a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC65A	14644 bytes
SHA-256: `8260f995ec47be0eb26c9d21eb3895dedae416d4db4d3199ce79e2508025c2c0`
`font_02_sfnt_off0000eaee.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEAEE	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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