Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a9a5b1262b76630…

MALICIOUS

PDF

88.6 KB Created: 2021-07-18 22:27:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ec4125c47fcef8b1b75f8207766b4bb3 SHA-1: da37201ac79e56d86c181d16f596a403c2d23b53 SHA-256: 9a9a5b1262b766307ab8ff7faf1d41a78cd7c117335b733ec7559b87bd9a33a0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised WordPress upload directories, indicating it functions as a link farm to distribute further malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/205ejij415f3osu4iuprkqm1s6/70682617091.pdf In PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609a0e99539cd---13862557998.pdfIn PDF document text
    • http://elateridae.com/images/FCKeditor/file/fusazaje.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/45bbb1b34140f2d0595c3e314903ca5d/nazonur.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a5e77f6c0---95586679503.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba3fb9c781---xulejowusuguv.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d1899db3134---46795946795.pdfIn PDF document text
    • http://spalovnachemolak.sk/userfiles/file/vimejufitomigevekudajuk.pdfIn PDF document text
    • https://www.reflectionuk.com/wp-content/plugins/super-forms/uploads/php/files/ucgjl10c6tjsn7ee57t9o3ba5g/78183720599.pdfIn PDF document text
    • http://prociweb.hu/sites/files/file/pikifurofuzeravugapol.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c418359e039---boxibuselaf.pdfIn PDF document text
    • http://ever-pioneer.com/upload/files/13015956285.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/65769371609.pdfIn PDF document text
    • http://hayatteknoloji.com/webimage/file/43007916844.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/818a103914242cf706cf60ac88ee1bd1/vudogunusuj.pdfIn PDF document text
    • http://clubmaniacr.com/campannas/file/sitewupipuroli.pdfIn PDF document text
    • https://ashleymongolia.mn/uploads/files/suluzimunafala.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160872c4fae9ec---botiluwifepemisezulugen.pdfIn PDF document text
    • https://footballsod.com/images/ck-uploads/files/bikejosipasupudoti.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607033970a021---40410885694.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/jo5h4qqiiuhf105t678ar5odi9/12585264735.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd62c56f71---moribe.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608a57bf5048a---39082040577.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/8267c1dde81c21a5cfcb35b34fd8b080/puvemebaxowerulipifez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=moment+of+inertia+of+rod+about+centerPDF 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.

FilenameKindSourceSize
font_00_sfnt_off0000f78a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF78A 17100 bytes
SHA-256: d068601d2a8b239f14ae34c3ea812913c64aefb07fd60c86bb81f65145393701
font_01_sfnt_off00012442.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12442 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013c59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C59 10656 bytes
SHA-256: 1fbfb5a0f5491f5538b24b4dc8243602c1d29fcbafe21bce9e6724e3c5defcfb