PDF malware analysis — malicious · 8a01d953cc55a489

MALICIOUS

PDF

85.2 KB Created: 2021-09-07 23:19:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: ee19d195522b8d58938d1f995c52331b SHA-1: 067398bb1b5176e7ff8fa975ff96c665d9e0fe0d SHA-256: 8a01d953cc55a489d9a69cf61ade66366ebc1aecf9a881da3a068ddada9513ea

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users. The presence of invoice-related language further supports a phishing lure. No scripts were extracted, but the PDF structure itself is used to host these malicious links.

Machine Learning

Nyx PDF Classifier malicious score 0.9905

Heuristics 7

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.
Fake invoice / payment lure low SE_INVOICE_LURE

Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
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://okud-istra.hr/userfiles/file/gufasitomenujijusibigese.pdf In PDF document text
- http://yjsyrj.com/userfiles/file/1442498152.pdfIn PDF document text
- http://xn-----6kcaheblih5ab0a6afqbzoqe.xn--p1ai/ckfinder/userfiles/files/fasasakarenomi.pdfIn PDF document text
- https://facades-metal.ch/ckfinder/userfiles/files/21447094547.pdfIn PDF document text
- http://salukool.ee/upload/userfiles/file/29347937485.pdfIn PDF document text
- http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac6c2dead2---39656375749.pdfIn PDF document text
- http://pphu-joanna.pl/fckpliki/file/65886823018.pdfIn PDF document text
- http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3c0c6ece85---31801464112.pdfIn PDF document text
- http://yousefmaktabi.com/ckfinder/userfiles/files/nirosodajoriwarakatoviz.pdfIn PDF document text
- https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/5bef1545a9ca7db8b98dd12969423b05/55866088793.pdfIn PDF document text
- https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/161108bddab779---fetavugidido.pdfIn PDF document text
- https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160982ff6cc2c4---bidivaboxusafe.pdfIn PDF document text
- http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/2b4fc3ba9fcf547a09f755d817899f29/beranuwefafadakedes.pdfIn PDF document text
- http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/6ji7ct0pq9kbeem1h3t0prqva1/wemituxugavasewi.pdfIn PDF document text
- http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/7275962451.pdfIn PDF document text
- http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608b5e6ab8894---zamupudunufaxetitedokipu.pdfIn PDF document text
- http://torgoborud.org/images/file/97695374894.pdfIn PDF document text
- https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16097c7cad5777---namaloredeboxosovu.pdfIn PDF document text
- https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/9a3def590a594a22d848e723e60a7de3/solasalapobutobufuwexisub.pdfIn PDF document text
- https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/24ab968a12f810cefe96355db9d4adc1/90545277869.pdfIn PDF document text
- http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b7832fdf579---43651471597.pdfIn PDF document text
- https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/ec0bedff8a160170d1e8f066373484e7/82777029089.pdfIn PDF document text
- http://hakkabrothers.com/userfiles/file///tiwafasolefivaziwazuji.pdfIn PDF document text
- https://kolkatanagariksammelan.org/ckfinder/userfiles/files/kimivo.pdfIn PDF document text
- https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/35c0748e6aee81b9b97cb005323122ce/43856038281.pdfIn PDF document text
- https://globalybm.com/ckfinder/userfiles/files/1630907729.pdfIn PDF document text
- http://newo.ru/files/files/kosuxudoviwiwabe.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=clep+exam+list+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_off0000e81c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE81C	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off00010033.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10033	10468 bytes
SHA-256: `8fa690127838b442b68130ca5b87b00ea19815d97dc67365a8a3358d51292696`
`font_02_sfnt_off00011806.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11806	18056 bytes
SHA-256: `815f6e391253109da0e94ffb95f47c1876bf90b9e340057e5af812038433576c`

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