Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4abac86a85165ca…

MALICIOUS

PDF

86.6 KB Created: 2021-07-13 21:36:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 373eaba741178611f5e1bd3727d78277 SHA-1: a84657cd6defbd610f37be55c38db39776994c5f SHA-256: a4abac86a85165caf11c0fae4adf6809e8fd834b7aa112aa6728affcfcb7876a
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that exhibits characteristics of a link farm, with numerous embedded URLs pointing to various domains, some of which appear to be compromised. The ML classifier strongly indicates maliciousness. While no scripts were directly extracted, the structure and URL patterns suggest an attempt to lure users to external, potentially malicious, content, possibly as part of a phishing or SEO-based attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 5

  • 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://batikatravels.com/userfiles/file/fibikunakozusutozoxesa.pdf In PDF document text
    • http://challendor.com/fckeditor/upload/file/74472913388.pdfIn PDF document text
    • http://relocationservicesgroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc24d035fa---panolov.pdfIn PDF document text
    • https://krassimirtaskov.com/userfiles/files/34224550670.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/hidl84g3scehc40ucvl312q530/46802375645.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/tademezegobaxaxir.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a8840583c47---71503451866.pdfIn PDF document text
    • https://girl0229960192.com/upload/users/files/musosa.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/dosofituba.pdfIn PDF document text
    • http://bukharaalpharetta.com/sites/default/files/file/zixabilitiwuwagikit.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16078ab5d54777---zuwikegemuwikulolelonusu.pdfIn PDF document text
    • https://abandassociates.com/ckfinder/userfiles/files/8638321170.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/kakebivifedetux.pdfIn PDF document text
    • https://travelinnsuites.com/nbloom/fckuploads/file/patomuzejod.pdfIn PDF document text
    • https://bamor.org/userfiles/file/49230948780.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c981db0da2f---29849126620.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/a9198261e6aa21c54eced7f2bde34e22/boziluzepugevajutebulu.pdfIn PDF document text
    • https://svrcontractors.com/wp-content/plugins/super-forms/uploads/php/files/a34a0eb22f923b305aecddeba883702c/xogukisaxufajulerokune.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/e82ca9edcd3a8f3098fd4b328f5eb228/bawaruni.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160cb5620d3ec2---talofopemojuvujifisur.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/e27d95519f487202e3272dcf5c894aa4/fomivope.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f8e10dc3d7---tawotagomagivotumosa.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/9amoc5qopcrj5smcv84k3fdael/lelefujivajedupoxot.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/62117192171931b220e1f67bab816a54/buraravofumupimifavinab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+make+nipple+clampsPDF 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_off0000ed1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001052d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1052D 18804 bytes
SHA-256: a44fc0c1c2f4679fe558444d623b3df46cb1eafa107a1ec823d1e1b5363852ef
font_02_sfnt_off00013549.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13549 10604 bytes
SHA-256: af9fe93e1b2587b8b2dccffc256028e2964d459414d0697dfee824b58c6ba45f

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