Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bcb1674a4e4a0f8…

MALICIOUS

PDF

78.5 KB Created: 2021-09-01 03:00:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: de27664f8cbb49d07c0b103b23db2ac3 SHA-1: f7695383cce06deec9fd7dde8bc83f36ff67d27d SHA-256: 3bcb1674a4e4a0f89983f3101cde75305a9c896867270f4ab2a5f353e002d109
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple domains, some of which are hosted on compromised WordPress sites or disposable hosting. The embedded URLs suggest an attempt to trick users into downloading files or visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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 http://phuketdriveschool.com/userfiles/file/42853602272.pdf In PDF document text
    • http://zonwering-belgie.eu/ckfinder/userfiles/files/67458828345.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/82985926148.pdfIn PDF document text
    • http://wxeina.com/userfiles/files/74572361699.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16104f7864e686---1953544836.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/74ea6dd47ceda136365003ca21d3f049/xuxipuserebos.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/8el9imtqeuav0rmcgbpmgs0gh7/87312966277.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/rsk25pt69hlpl00umo4q4ijuh6/nobul.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/6020ddaac04dc8e02cf3dc72e44a2b2f/xokibelebiduboroxug.pdfIn PDF document text
    • http://delfosventures.net/userfiles/files/sapidozumibune.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/16118f6f4581b2---77324816351.pdfIn PDF document text
    • https://betentour.com/sites/default/files/file/92773564338.pdfIn PDF document text
    • http://blossomtour.net/FileData/ckfinder/files/20210814_BF668A380C5646C2.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/db81a6f3481463971c33e1f3fc05efda/kuvezikixavamiwu.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/16099e1b30b30c---35254492566.pdfIn PDF document text
    • http://asokmontridental.com/userfiles/file/55061326623.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16103ef84e25b6---98360286878.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/8b103ae229829f552ba5f992b9173cd8/72925785752.pdfIn PDF document text
    • http://studiotecnicoprato.eu/userfiles/files/16994196372.pdfIn PDF document text
    • https://marbeyoyun.com/calisma2/files/uploads/28558986464.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c76bcff1603---67395218033.pdfIn PDF document text
    • https://searchkar.com/ci/userfiles/files/6571152203.pdfIn PDF document text
    • https://postelezmasivu-plzen.cz/ckfinder/userfiles/files/vewivi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=download+pes+2020+for+ppsspp+highly+compressedPDF 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_off0000cd38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD38 11412 bytes
SHA-256: acf223e66850218dfd83316a574068dd2fbce86d7e7434739938b7ba73115a67
font_01_sfnt_off0000e7d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D4 16748 bytes
SHA-256: dc4515864891834e57ef0a05b3389395c2eb473f8a87c6230622538bd83a85ff
font_02_sfnt_off00011353.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11353 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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