PDF malware analysis — malicious · f8a0d58e418ef9ba

MALICIOUS

PDF

100.1 KB Created: 2021-09-03 13:35:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: d89afd540c3e1a43842af442eb4cc1c9 SHA-1: e2e69f95abc856659d8fee98d18759acd6099c82 SHA-256: f8a0d58e418ef9ba8315ff53b8d2a04f66c2b620e11472f7f52caef76db570c4

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains numerous links to external websites, many hosted on compromised WordPress sites or disposable domains, suggesting an attempt to redirect users to malicious content. The PDF structure and embedded links indicate a phishing attack pattern, likely aiming to exploit user trust by disguising malicious URLs within seemingly legitimate content.

Machine Learning

Nyx PDF Classifier malicious score 0.9875

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://medvor.ru/uplcv?utm_term=balancing+chemical+equations+worksheet+answers+1-25 PDF link annotation
- https://anbuadidravidarmatrimony.com/ckfinder/userfiles/files/65661887155.pdfIn PDF document text
- http://skogsformedling.se/bilder_umeny/File/rotegokebuf.pdfIn PDF document text
- https://museuminiaturesbesalu.com/files/66482564923.pdfIn PDF document text
- http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9dcf061d4---lexoxumumere.pdfIn PDF document text
- https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082484a75e75---sikavaluzekogufupovob.pdfIn PDF document text
- http://creativetechno.in/userfiles/file/65936630328.pdfIn PDF document text
- http://endemic-capital.ru/uploads/files/balufafulonen.pdfIn PDF document text
- https://gulceoyunlar.com/calisma2/files/uploads/widisirupadabomupiw.pdfIn PDF document text
- http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b010d7a709---punujejopureduduk.pdfIn PDF document text
- http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9dc3f1d14f---porosom.pdfIn PDF document text
- http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/1606dfbe1bdcc0---fusipowudibotuzoguwupofi.pdfIn PDF document text
- https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080d2827edd7---2843094801.pdfIn PDF document text
- https://horacebatten.com/ckfinder/userfiles/files/43228195855.pdfIn PDF document text
- http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b36eda5a70e---mibosoke.pdfIn PDF document text
- http://bettynblue.com/upload/fck_img/20210708/file/wiketutidizelasoz.pdfIn PDF document text
- http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091fd6d9fddb---sizapuvabisi.pdfIn PDF document text
- https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610533ab1105d---xokobavejajabobemadilax.pdfIn PDF document text
- https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/eaff9b1e4de0d4dc8f2f2a77710e47c7/62307840246.pdfIn PDF document text
- http://ccsl.asia/files/37083638596.pdfIn PDF document text
- https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/630a48338551655ac1b1af909470d65d/mafajanija.pdfIn PDF document text
- https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/82f7ba722e840edb5162800bc8373822/witovopelarelesoko.pdfIn PDF document text
- http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8655ca78b3---40957855877.pdfIn PDF document text
- http://colokit.thienlonggroup.com/Images_upload/files/nelemuwevafusize.pdfIn PDF document text
- https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d5cd929e91e---tozezejejetolegakezupopi.pdfIn PDF document text
- https://nezrenweb.com/calisma2/files/uploads/62393992841.pdfIn PDF document text
- https://aadhaarretail.com/administrator/imagetemp/file/zipawuludasonozamurevun.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_off00011752.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11752	21104 bytes
SHA-256: `8d68cbd89da68d2388dc382e2c39081c3c1b7791197248ff8d724a2962a20b2e`
`font_01_sfnt_off00014ee7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14EE7	11496 bytes
SHA-256: `b207f0b315bf068039b4c239a6c5784b13c118f71fd06e559c76e1cfb3c78004`
`font_02_sfnt_off000169e5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x169E5	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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