PDF malware analysis — malicious · d93d7573f37d352b

MALICIOUS

PDF

85.9 KB Created: 2021-06-28 05:50:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13

MD5: 5959f36b9ef449441adb09c9db403e8c SHA-1: 7ad64c7c7571064f1c6e6fac9594ce23ad7b52fb SHA-256: d93d7573f37d352be6b6f855d140a2f08ca69f3ce5fe08ca6841ae37f0f135f5

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF document was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous embedded URLs that point to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of these links indicates an attempt to deliver a payload or phish users, aligning with spearphishing attachment tactics.

Machine Learning

Nyx PDF Classifier malicious score 0.9848

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://pistant.ru/uplcv?utm_term=the+oldest+art PDF link annotation
- http://grafordexstudents.com/clients/0/05/05b3dbe7dd9dc6f92b523d2b721f2ffd/File/78944645289.pdfIn PDF document text
- http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16097774d3a136---rozobesemeno.pdfIn PDF document text
- https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1609e20ce713bd---33971909571.pdfIn PDF document text
- https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/4242605e538f50d3f30e524526c987c6/bikifebigunu.pdfIn PDF document text
- http://www.annaleehuber.com/content_files/file/wofefatetep.pdfIn PDF document text
- http://agcslohian.com/userfiles/file/10076926878.pdfIn PDF document text
- http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/ft4m54njeo4rl5ntvcfpili3q2/14726890254.pdfIn PDF document text
- http://akcjonariusz.com/UserFiles/file/kubaxalibijigesusuzej.pdfIn PDF document text
- http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607510592e653---18234585374.pdfIn PDF document text
- https://etonbio.com/newsLetters/images/file/dusasuwokosuzuzuletasev.pdfIn PDF document text
- https://my-natural-style.net/upload/files/tonabeluwadir.pdfIn PDF document text
- http://ztkammer.at/uploads/file/40096536402.pdfIn PDF document text
- http://guilfordvikingsclassof81.com/clients/4/47/479b0a304b4cdce99dfe3eda73a59016/File/rusufidopimudujezafelawi.pdfIn PDF document text
- https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160bb451eac5a8---71866209938.pdfIn PDF document text
- http://osc-pribor.ru/products_pictures/file/nalafasejesexifulekexa.pdfIn PDF document text
- http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/63f941f0cbaacd25cc4b65f5df097966/92898480719.pdfIn PDF document text
- http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098597cc92c4---35906226512.pdfIn PDF document text
- https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/5fefa4e8059d731062bbdd9ec439f69b/96340048571.pdfIn PDF document text
- http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4b0791553---vetijo.pdfIn PDF document text
- http://kagoshimakojintaxi.com/userfiles/file/mipujivetesorolozeno.pdfIn PDF document text
- https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/520af51a5abc2ff14471fc03d2bfefb2/35087963285.pdfIn PDF document text
- https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/91136197510.pdfIn PDF document text
- https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/677861bfe73063a2bcec267440a33936/99153376874.pdfIn PDF document text
- http://alexanderjamesbackcatalogue.com/userfiles/file/midarukunazeruxefuvido.pdfIn PDF document text
- http://lnaixi.com/userfiles/file/20210624020910_224323840.pdfIn PDF document text
- http://daydreamspin.com/userfiles/file/kijumulu.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_off0000f0f9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF0F9	16420 bytes
SHA-256: `350f205f1693ee1dfe02d6d6b613c3834c7021626fa17ab9c5c8eba3158ec047`
`font_01_sfnt_off00011b80.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11B80	10112 bytes
SHA-256: `ff1a04dd6d3bb684387d5d5e1f4da34c83bb9548ed37dec6353c0bfdf07dbfd0`
`font_02_sfnt_off00013247.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13247	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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