Malicious PDF — malware analysis report

Static analysis result for SHA-256 d49b5bd1dcb239d2…

MALICIOUS

PDF

128.6 KB Created: 2021-08-20 00:30:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d30b37169067251e8dda75135db32341 SHA-1: 391877cace61606ce46a2622d2cdf21639132083 SHA-256: d49b5bd1dcb239d2863103c5a31c83acd4720b81c1494b9d9287205ccc500086
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or trojan distribution vehicle. The document functions as a link farm, containing numerous URLs that point to various websites, some of which are hosted on compromised WordPress upload directories. The presence of these links suggests an attempt to lure users to malicious sites for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cn-daomeng.com/upload/userfiles/files/949a925ebc3df9d8380386984e5f368b.pdf In PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a8f8c17fc7b---jaloxazojavanidojuleto.pdfIn PDF document text
    • http://mytaylormadefamilyusa.com/clients/864113/File/2159868311.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/53941742411.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac06ab398a7---bumug.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/ec7cfjsm9rcfdbvp6cc9qpvepj/dajojigoxufurokewuxesojiw.pdfIn PDF document text
    • http://letsbelegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/basepodulolum.pdfIn PDF document text
    • http://mh-gartengestaltung.de/userfiles/file/71480204493.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/4f33ac585ec88232c9252857c58c4ed6/tubewuvod.pdfIn PDF document text
    • https://doctornhospital.com/banglanews24/editorsfiles/files/jomalibotavom.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160af77e0651ed---puwogamedeli.pdfIn PDF document text
    • http://auburn-companies.com/userfiles/files/lopofalujuluguropiros.pdfIn PDF document text
    • https://big-affaires.com/img/pics/files/97859606787.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/kawademifagov.pdfIn PDF document text
    • https://actor-conseil.com/files/file/83936395174.pdfIn PDF document text
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608679b215807---mudeve.pdfIn PDF document text
    • https://netiko.fr/img/Data/file/fukojogofezewavetomuwi.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/1jjc25ovqu005sved5i3uftisj/babolufelezuladiwideneb.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/12709c367809c5216a732572348d97d9/tugalibubutefuzok.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/a360dd4f4fdfd5dddc049474ffc7506a/notesuxata.pdfIn PDF document text
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/eq8n8a3frdcvu9142gco39hk4k/nonoxesowokixivivonisafu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=baby%27s+day+out+download+hindi+dubbedPDF 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_off00019297.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19297 10772 bytes
SHA-256: 4c05919ecfb47245aa8129fc1d7113f26c98a33ba1cdf0f8c363e7bb2a00db87
font_01_sfnt_off0001ab77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AB77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001c389.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C389 18176 bytes
SHA-256: fcfaad5487a9878890c6ec8fdaf097729cc5d3742caf1e335a773083af409ba5

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