PDF malware analysis — malicious · a54c64c080a9da78

MALICIOUS

PDF

86.4 KB Created: 2021-07-28 13:23:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: a9ae7879d6ba85bb74c43c4ab2e80303 SHA-1: ac32153d78c113c2adf9ec6fc30de951c2f0d243 SHA-256: a54c64c080a9da78bee38d9528608afb64abc1207cb0166fc9b2bcc14cd19ee7

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites, suggesting it's part of a link farm designed to redirect users to malicious content or phishing pages. The presence of multiple distinct hosts and a high number of links indicates a coordinated effort to distribute malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9905

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://kodcomputers.ro/2664/uploads/wakusumaj.pdf In PDF document text
- http://smith-williamssisters.com/clients/d/dd/dd6cbc7353a6ef31c13ccaa63ab862ac/File/71245584045.pdfIn PDF document text
- https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/s5vbp3uev2m9n55qlnsnp9hs50/54316535259.pdfIn PDF document text
- https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/28416cf2bffaf8a6f1cbe74bb890168d/39016484045.pdfIn PDF document text
- https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db4eaea2975---xefapomokunubitakoxiger.pdfIn PDF document text
- https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/5fe245506dd49c13aa959ba87d09e632/fodimugevuweb.pdfIn PDF document text
- https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/ta0181e8b9uochapf13ip42q7g/ruvapaxopazub.pdfIn PDF document text
- http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cded0021016---babirokigem.pdfIn PDF document text
- https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/088b88cf958dbaf2cd2b6255a0dea326/91333162125.pdfIn PDF document text
- http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160906b898aa4b---zuxafideg.pdfIn PDF document text
- http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160a1445450219---wisebuwixakimugadun.pdfIn PDF document text
- http://wisdomtours.net/upload/file/90377162943.pdfIn PDF document text
- https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/118dc28513931691b275d40afee0a28f/koxax.pdfIn PDF document text
- http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c16822f2c58---60072965153.pdfIn PDF document text
- https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/fe1b705d996d6d4b36c130a76b2721ad/rifujovajupejital.pdfIn PDF document text
- http://tetraeng.it/userfiles/files/53975706692.pdfIn PDF document text
- https://tort-art.ru/userfiles/file/933487722.pdfIn PDF document text
- http://copy2d.com/ftp/image/file/5119150269.pdfIn PDF document text
- http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160989bedae62c---58954354943.pdfIn PDF document text
- http://avsa.org/sites/default/files/images/files/14024745913.pdfIn PDF document text
- https://contabil-fiscal.ro/mm/file/61067914519.pdfIn PDF document text
- https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160708294d1179---josikasuradefizukaripogaj.pdfIn PDF document text
- http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e515672ce00---61639414929.pdfIn PDF document text
- http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160be6e9404b93---lopavosofiv.pdfIn PDF document text
- https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/k2vl4nqgkgun640ttpr9vj0nnt/puvewafurakovosoxar.pdfIn PDF document text
- https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/c7ca539db2471d1d826e4b0471516c73/62819713776.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=vocabulary+workshop+level+c+unit+10+synonyms+antonyms+answersPDF link annotation
- http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aca38c8a29---1043943908.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_off0000f1fa.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF1FA	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off00010a11.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10A11	11380 bytes
SHA-256: `fdd4d70d28363267c75a60b31173acfe0ce9089038b5e60cc74d38468e7f478a`
`font_02_sfnt_off0001249f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1249F	14456 bytes
SHA-256: `cd47f3a3217ac72de719cc4e3354c7943345f6cb250a94fbe6aa50d30c326d05`

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