PDF malware analysis — malicious · 5e8d5776b8fd1eba

MALICIOUS

PDF

85.5 KB Created: 2021-07-10 02:34:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13

MD5: 8940a2c00cc87dc631721a9fc21255a3 SHA-1: 23a65c863fd16b999e9e0646a02243648217dc76 SHA-256: 5e8d5776b8fd1eba52fabead55ee4d473be5dfb3cfb67a09afdb3f46d63bd812

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the nature of the links and the PDF structure suggest it's likely intended to redirect users to phishing sites or download further malware.

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://crewmak.ru/uplcv?utm_term=making+guacamole+with+hard+avocados PDF link annotation
- http://cocoal.com/uploads/file/mupim.pdfIn PDF document text
- https://dialogueinpraxis.net/files/docs/dokifojuxawigalel.pdfIn PDF document text
- https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c6e5a593766---sedasatomomupaduvoke.pdfIn PDF document text
- https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/621478ed6ca097069e81bfc4a8fbb66b/votasejabebaji.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d8ab27b3c4---96803412889.pdfIn PDF document text
- https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/fed08b612d09d53d55727780fc3ae588/vegokefesale.pdfIn PDF document text
- https://royal-art.pl/uploads/userfiles/files/bawewazetiwewegegotedaw.pdfIn PDF document text
- http://xn--80aadq3ae7aa5k.xn--p1ai/upload/file/64197792784.pdfIn PDF document text
- http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080b2afb7dcd---12634468392.pdfIn PDF document text
- http://closehorses.com/userfiles/file/6970752803.pdfIn PDF document text
- https://advantagelic.com/singhania/downloads/file/kixukiwawojisipigil.pdfIn PDF document text
- http://richmore.kr/uploadfile/fckeditor/file/92129198126.pdfIn PDF document text
- https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/c44b733aa96950bcdea31cce7ee19569/suzurisozimuni.pdfIn PDF document text
- http://bristolvietnam.com/upload/ck/files/56577357253.pdfIn PDF document text
- https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/3f049825119ea8cf7bc7905eedfd09b9/debumedizemi.pdfIn PDF document text
- http://siripanyalamphun.com/user_img/files/xakenijam.pdfIn PDF document text
- https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/veag9o5bg1k3gukajb5h8koa41/3838505803.pdfIn PDF document text
- https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609d147385526---tinatokigekulawof.pdfIn PDF document text
- http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160929e389dda8---17684202714.pdfIn PDF document text
- https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/l5mofiua595jls60tsu686jbpj/73992017615.pdfIn PDF document text
- http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b335ced2fb0---memokilorilinato.pdfIn PDF document text
- https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/752dfff0e795a7a0d0968cccb1816895/nekuzolalikexevugemed.pdfIn PDF document text
- http://duancanhotot.com/upload/files/xuwijekonixofov.pdfIn PDF document text
- http://antansconstructions.com/ckfinder/userfiles/files/35512551808.pdfIn PDF document text
- http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/jakmvjbk5uluvp7j67thjcvce7/10272309464.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_off0000e9d9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE9D9	16752 bytes
SHA-256: `37ff4ef4828e43437f764c57196933e1c106c5a9e56c3fb24376e95591b9fed7`
`font_01_sfnt_off0001154e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1154E	11152 bytes
SHA-256: `188d2b146516f4daf476edfb6e8b1cc72a91fb6d5439d0bad5da5405230bd55c`
`font_02_sfnt_off00012f11.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12F11	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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