Malicious PDF — malware analysis report

Static analysis result for SHA-256 378ad8c797fc5737…

MALICIOUS

PDF

68.5 KB Created: 2021-09-05 02:27:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a9a3d05f037b3b5e980e6e5d553e819b SHA-1: 3c9ee01a13772f285bdda8bba980fbcea7cb1bb8 SHA-256: 378ad8c797fc573768f1f647ff33de700813275446b041dd54867d552ec00853
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file exhibits characteristics of a phishing lure, including being image-heavy with minimal text and containing numerous external links. Several heuristics indicate it's a link farm pointing to compromised CMS upload storage, suggesting an attempt to redirect users to malicious content. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a6cfce93afa---29215001734.pdf In PDF document text
    • http://bebelino.ru/userfiles/file/1280235982.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bc7f93cfedc---mawitukuparikanezose.pdfIn PDF document text
    • http://mastera-mix.ru/ckfinder/userfiles/files/11816571678.pdfIn PDF document text
    • https://x-software.cz/data/file/wuninagixabamejufem.pdfIn PDF document text
    • http://ximangsongthao.com/app/webroot/uploads/files/54448101739.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4126b5a0d---gilokejufudomipusurefi.pdfIn PDF document text
    • http://energyexcess.com/userfiles/file/48915809722.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/ltf6tnngr05ud6vludjns2u4b7/78654097494.pdfIn PDF document text
    • http://ueros.fr/admin/ckfinder/userfiles/files/gukofusebiretux.pdfIn PDF document text
    • https://rkdestate.com/userfiles/file/luwozo.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8d09217e0---81047178799.pdfIn PDF document text
    • http://papierplus.pl/userfiles/file/gupipugotigagobufep.pdfIn PDF document text
    • https://chandrakantmusicacademy.org/ckfinder/userfiles/files/1559101332.pdfIn PDF document text
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607dddcaef53f---zidagivuvew.pdfIn PDF document text
    • http://europavloeren.nl/siteimages/file/17354290814.pdfIn PDF document text
    • https://arerp.kr/data/file///kekajuvomudugok.pdfIn PDF document text
    • http://lex.tj/img/file/65989196393.pdfIn PDF document text
    • https://kaxtongroup.com/home5/maxconne/public_html/kaxtongroup/assets/images/newspostimages/files/buzesomebosamurofu.pdfIn PDF document text
    • https://renault-service.com/userfiles/58087035948.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/ps2kaepl69jsfu2m9ngu6sp8na/mujanapataxisava.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=free+printable+worksheets+on+commutative+property+of+additionPDF 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_off0000addd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADDD 14364 bytes
SHA-256: 966edaf39bd4ec2d6d506fc0e7de99581a55a97e5b00d906e8001efb8ed7b557
font_01_sfnt_off0000d16f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD16F 11460 bytes
SHA-256: a177c6623c01def753da9114862e7d8a16837a6dfabd02bb7f28dc6df4d86770
font_02_sfnt_off0000ec2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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