Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d11378d5bcd1e76…

MALICIOUS

PDF

103.3 KB Created: 2021-06-28 21:19:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 6fdbf7d8feb2545dde81694337dc9ba7 SHA-1: 26c4c2770bae166da047cf81181f7249526ed32f SHA-256: 0d11378d5bcd1e766a9a03f9e5c9df09a09f27d29a413a76fb9624dd389577c3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed for phishing or malware distribution. ClamAV detection and ML classification strongly suggest malicious intent, likely related to phishing campaigns that leverage these link farms to redirect users. No scripts were extracted, but the structure and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

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://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f33c859579---54992050498.pdf In PDF document text
    • https://digicpictures.com/downloads/mubukuvasefakujum.pdfIn PDF document text
    • https://rabudiagnostic.com/userfiles/files/6698798937.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/8d1efbf75859f923fcae8bc0e1131287/98572869594.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606f24dc53bc9---pivariromuzipoz.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b66339c63e6---sufaforosusukifim.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/16783868126094c9dcb1ee3.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160750e033f0db---99782086005.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/a0ac40be3f17ec9cd3488258507915cc/87251823409.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210501141824_1192780867.pdfIn PDF document text
    • http://bocghebinhduong.com/media/ftp/file/xejuxubulopixefeti.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084a075d69be---90026370505.pdfIn PDF document text
    • http://udokutscher.de/gfx/userfiles/files/kodugepujamabuxofupezet.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/qn1oga6u4aah1o3q7qn6a7s8b7/matorukafezalajazanadejaf.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/cf0b7ea16332738f2c82481b63455b65/vobizuzumezifatavofupiku.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/6f8489b4dfa3f78e932eb289e7e85080/97594299778.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1607a346694428---gugunenipawek.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16078d7a7daf75---75444507685.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160c6a7f171fbd---nigegase.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b77d78da0fc---zubatutuwaveseriteseti.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc9c91c4202---riwasunetapimirejaro.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6e0caac6a2---pujuzodid.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/pasirotodudib.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/6c9e9eff6932d321e7740f20e4f988a7/sidabowimozivefiboboxikom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=herpes+and+dementiaPDF 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_off00012ec8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EC8 18708 bytes
SHA-256: f453ecb201655d6165050335a96bf1206f3f2ba01972e25365e4e6238aaad10c
font_01_sfnt_off000160a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000178ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x178BA 10376 bytes
SHA-256: 98c2032ea8ab354592868835518ad73f2490726e5859d8fe1d1f5ab432076a16

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