PDF malware analysis — malicious · f49eb2b158a131cf

MALICIOUS

PDF

87.7 KB Created: 2021-07-17 15:36:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29

MD5: 0b7d37cd883c8a67021033270d9bbadc SHA-1: 3142ae37cddd0b867ba2b3b89232178c6bb161ed SHA-256: f49eb2b158a131cf5b11665f03f2c5049e2b6841c6a76024a4a1dc718e1c854a

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a link farm pointing to numerous URLs, many of which are hosted on compromised WordPress installations. This technique is commonly used to distribute phishing content or malware. The ClamAV detection and ML classifier strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

Nyx PDF Classifier malicious score 0.9835

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 https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1609c1e6879769---36663788550.pdf In PDF document text
- https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/ea66f7f55de122d8e93dbad61bae744e/1504476139.pdfIn PDF document text
- https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/761466c717abf38d1dcc18682f367021/74775476543.pdfIn PDF document text
- http://bugaboo-buffalo.eu/UserFiles/File/wasepexalexe.pdfIn PDF document text
- http://www.aadhar-interior.com/userfiles/file/logusexekoletutuvigozutaf.pdfIn PDF document text
- https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606caa2683ac8---notomifilolijok.pdfIn PDF document text
- http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/0b2d81cf3af8ba626bcf1c2f53b3354f/netumetup.pdfIn PDF document text
- https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/8fef36e2bd8f7fce67e4d746552f0c10/64987064297.pdfIn PDF document text
- https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/ec439b06d601d55ce410f6e9cb751bea/73057812466.pdfIn PDF document text
- http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c2929ae9699---vegetuduxavi.pdfIn PDF document text
- http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16094b60828704---liwelodotizubotipon.pdfIn PDF document text
- https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/16073c4787a1f2---mikozivilaremijijopap.pdfIn PDF document text
- https://dbmotorbrokers.com/userfiles/file/14785063048.pdfIn PDF document text
- http://bestbuyfromindia.com/userfiles/file/kipodexotuma.pdfIn PDF document text
- http://lbhs1965.com/clients/6/6b/6bdd8f708684a1f547efbf97e1630fe5/File/tegekazoxitu.pdfIn PDF document text
- https://acgroupenterprise.com/userfiles/file/29386422319.pdfIn PDF document text
- https://ottenburger.com/userfiles/file/suxoladibigosowa.pdfIn PDF document text
- https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/t251gt1l8ufgbdlnaom7r71f8e/9485806058.pdfIn PDF document text
- http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608280e950fb7---xokab.pdfIn PDF document text
- http://sh-ruiyangcpa.com/userfiles/file/2021-6///202163534573524.pdfIn PDF document text
- http://edwardlankin.com/clients/86087/File/mometek.pdfIn PDF document text
- https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/f62e77df27353893553e42916375003b/nerasazulenuwuw.pdfIn PDF document text
- https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160740b8f9fc3c---woduwapejofosopugomasek.pdfIn PDF document text
- http://andreaslasnik.com/data/files/96629902978.pdfIn PDF document text
- http://alliance-ltd.com/userfiles/buvaluzebejod.pdfIn PDF document text
- http://hotelbellevuepalermo.com/userfiles/files/wutirixop.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=technical+project+manager+resumePDF 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_off0000f4ad.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF4AD	16728 bytes
SHA-256: `b8777d7c336a7b4b57e59558f7429e255ca2a55768135f5fd500a6c0ea217a76`
`font_01_sfnt_off00012001.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12001	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00013818.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13818	11012 bytes
SHA-256: `d8dd1e8f7b1007b10a3fb29343cb3592f12657497f5a332d9c13a122c0a68c20`

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