Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a871d63c0f33498…

MALICIOUS

PDF

111.8 KB Created: 2021-07-01 17:16:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 77226372acd2ff4684fe1bc311191489 SHA-1: 7f3d83483c3a3925ac674e82fd5a9beca56eef92 SHA-256: 6a871d63c0f33498396d744ca9846a6814c560a181aba172a0a5f6ffc83161ce
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to compromised WordPress upload storage, likely intended to host a password-protected archive as suggested by the 'SE_PASSWORD_ARCHIVE_LURE' heuristic. The embedded URLs are designed to trick users into downloading a payload, which is a common tactic for malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://nomylo.ru/uplcv?utm_term=pranks+to+do+on+your+sister PDF link annotation
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad78f30809---67168435056.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/godimutulipalewuxefib.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/xagebem.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/492c0202d4962ef4f4aefe83978371d3/bakivuvunelovuzotipa.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/ciaqskuaehhgllicv7627joc35/pogapipaxutiz.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c939c13ebc3---jamagoniwadizopomufip.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/12598546412.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/9814237e7c70b50b0a9896bbdf8e8c5a/50601633994.pdfIn PDF document text
    • http://fkhd.cz/data/img/foroxaganarowutajorelu.pdfIn PDF document text
    • https://bachson.net/upload/file/77562968542.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083427a64908---49805364108.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b070345a4a6---75275911989.pdfIn PDF document text
    • http://axwelindia.com/uploads/mozati.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/84897984727.pdfIn PDF document text
    • http://www.bandungmesin.com/file/wuvipifikedivoturirorob.pdfIn PDF document text
    • http://taborcapitalpayment.com/clients/d/d0/d0a3925ee25d0adc8806453b18bccccc/File/13129984721.pdfIn PDF document text
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/cdb542e00f6597959c44387106c4f0bb/dowupusolijufaniteruk.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/6eafa419f1741f4e616e183008ca4ba2/zemilizigozixopexakataxi.pdfIn PDF document text
    • http://hibertek.com/image/files/20210628_133243.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/emo1gug7oqocvb5djhgnvfhec2/kefebutarit.pdfIn PDF document text
    • http://beiks.info/public/file/reniluzigiputulinuxob.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013c8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C8D 17328 bytes
SHA-256: 151391a5314ac9b65e16a21d784bdd2c6470a9128838a64328bb302bbb88027d
font_01_sfnt_off000169ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x169EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00018206.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18206 10500 bytes
SHA-256: 14a974c211ea7d5ab80e78dc9fffc146aa7fa96afe97768c0301ec01f8533f00
font_03_sfnt_off00019a18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19A18 16812 bytes
SHA-256: 9328609e976ab6da0d25e4590a566db38df9aa8f3e66556516f86cca9ae0404d

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