PDF malware analysis — malicious · 678dc328f3717824

MALICIOUS

PDF

78.8 KB Created: 2021-09-13 19:58:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: fa4967e84e4ac515b6e746e4a2e963a4 SHA-1: 519c602e9d7aeb3a68031ec7b4098a1f1e03d2ca SHA-256: 678dc328f3717824b21b39a64262fa4b24dd4621c346b535f4d383f91a2330b2

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to PDF files hosted on various domains, some of which are identified as compromised CMS uploads or disposable hosting. The document body is unreadable, suggesting it is not intended for human consumption but rather to host these malicious links.

Machine Learning

Nyx PDF Classifier malicious score 0.9940

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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://crm333.com/documentos/file/gasowodalaziw.pdf In PDF document text
- https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/93b1c3d08a70538306510724789f3a0d/sujotisawujejolab.pdfIn PDF document text
- http://goldendazzle.com/upload/quangtri/files/77149507031.pdfIn PDF document text
- http://christmaslandint.com/userfiles/rosarevipatiletuti.pdfIn PDF document text
- https://dolphinsolutions.net/ckfinder/userfiles/files/5912159826.pdfIn PDF document text
- https://rintrans.com/files/giredu.pdfIn PDF document text
- https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1613173a138e94---36166045387.pdfIn PDF document text
- http://scvumaichiramen.com/uploads/files/zimebibosafa.pdfIn PDF document text
- http://tingchucontrol.com/Uploadfiles/files/loliridegeganimidelexe.pdfIn PDF document text
- https://www.pelicanfinancialnetwork.com/ckfinder/userfiles/files/14627091780.pdfIn PDF document text
- http://kanoonkaraj.ir/dbmanager/filebank/htmlgallery/file///8038386396.pdfIn PDF document text
- http://xn--90afqerdlt1f.xn--p1ai/admin/ckfinder/userfiles/files/nujubowisipadasofudaduno.pdfIn PDF document text
- https://www.prieur-equipement.com/ckfinder/userfiles/files/rudodizabutunerurevi.pdfIn PDF document text
- https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/161370b6b2ebd1---fazegapivo.pdfIn PDF document text
- http://simsvizag.com/admin/uploadedfiles/file///73487050084.pdfIn PDF document text
- http://dongbanja.com/userData/ebizro_board/file/17298888390.pdfIn PDF document text
- http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134bf8e3e5e7---jomewabaxev.pdfIn PDF document text
- https://zerling.eu/nico/images/files/1161423052.pdfIn PDF document text
- http://konikanarrowfab.com/ckfinder/userfiles/files/jebixazix.pdfIn PDF document text
- http://aweibel.com/Photo/file/feweremogome.pdfIn PDF document text
- http://wksx.top/images/userfiles/file/71715969205.pdfIn PDF document text
- https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/9bdfd384ef84b7b0376f6061a2641d2c/93744397902.pdfIn PDF document text
- http://xyr59.com/filespath/files/20210906193133.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=donkey+kong+country+gbc+romPDF 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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000b547.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB547	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000cd59.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCD59	16852 bytes
SHA-256: `634f5834058784b8cd8507d4f4c366fbade8e797d4d0ad8902168cfba4224476`
`font_02_sfnt_off0000f832.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF832	18348 bytes
SHA-256: `56ec338484bb3b4562652bccbb9b00b29a4ea528ad8e4cb52c8d766df5daec2b`
`font_03_sfnt_off00011537.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11537	10552 bytes
SHA-256: `ace4708ce83835853d2909f86095eb7f0f9579db0ac84d013962d009adbd49c1`

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