Malicious PDF — malware analysis report

Static analysis result for SHA-256 4636116a6492b111…

MALICIOUS

PDF

77.3 KB Created: 2021-06-28 15:05:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 3fb9073c9429f7908d4f841135674b08 SHA-1: b991ec8affa19656b977ab0769bbedd7304b42ba SHA-256: 4636116a6492b1110b65ebdc50ec972c6732e5ae82b73795532d094909f2a77f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress installations. These URLs are likely used to host phishing pages or further malware, as indicated by the ClamAV detection and ML classifier flagging it as malicious. The structure suggests a link farm designed to obscure the ultimate destination and evade basic detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://crewmak.ru/uplcv?utm_term=introduction+to+environmental+engineering+4th+edition+solution+manual+pdf PDF link annotation
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/444unvodsdjsa4tf01gnerainf/fuxobu.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/01554f6448a3d82ac9e57ae16551c0c5/25654784716.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/wojanavekem.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b42a1510f4d---57787882975.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160875238a4d69---55140425010.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607f61f961dd1---52115335634.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607248d6db9c5---18248988805.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/4bebbd9d2ecf7a178377b6cb9df6c5dc/14484936598.pdfIn PDF document text
    • http://goldenbaycruisesagent.com/userfiles/file/15596157824.pdfIn PDF document text
    • http://dzbnf.com/upload/file///48717530251.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/a4aa0fcbd2c90a590b69afcfcd7c8881/40163679127.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609d25089e5aa---mumumigenosez.pdfIn PDF document text
    • https://dehayemek.net/upload/ckfinder/files/ritiremebawegopujuzovebo.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/f9652a7ef7228f3518f79d81ce6e6eed/14576521466.pdfIn PDF document text
    • http://boekenwinkelindex.nl/images/uploads/72353405197.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/62161998488.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16072e260066a4---60024795026.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/03fe646f3949baffade241f29ae1be6f/zejuzufogefobelufut.pdfIn PDF document text
    • http://thebaileyfamilyreunion.com/clients/6/6f/6f45d7e5c9279c15d0bd3a3fa6949618/File/wevagosunu.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16095cda0a02ae---wiwivozimorejoxol.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/aa1b3253cf7c85576b5daad57e964dff/2840606323.pdfIn PDF document text
    • https://whiteelephant.co.in/wp-content/plugins/super-forms/uploads/php/files/f38ba60d773a806ba63059b8ed4a928d/kotosurugileli.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf6f69a685---vuriwolumivibuga.pdfIn PDF document text
    • https://activepymes.com/pub/file/13633268335.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/saxokopa.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.

FilenameKindSourceSize
font_00_sfnt_off0000c858.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC858 16976 bytes
SHA-256: bc53f6adc3bad15bc01ea04552d4dc6cf51d4256ee32ba48c99afd6ffde5a51a
font_01_sfnt_off0000f4db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4DB 11264 bytes
SHA-256: 9077fe671f876b3a8fbdaf8b247653bb29a165bf109885813954c2227906299e
font_02_sfnt_off00010ef5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.