Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a5becb3ef4ad002…

MALICIOUS

PDF

83.3 KB Created: 2021-09-16 09:01:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3dff6d471310b37cfd02566099814785 SHA-1: 989196705376cbbd0acec1c633e588febd0fc85d SHA-256: 2a5becb3ef4ad0027693d49a5e209865837cb93c03ffcee8239d5cd0e72dcf25
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, flagging it as a phishing trojan. Static analysis revealed it functions as a link farm, containing numerous embedded URLs pointing to various domains, some of which are associated with compromised CMS uploads or disposable hosting. The presence of these links suggests an intent to direct users to malicious or deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://storemisr.com/uploads/files/51603154645.pdf In PDF document text
    • https://kingcom.edesign.fr/gr33/web/uploads/assets/file/20257322660.pdfIn PDF document text
    • http://opuspointpartners.com/ckfinder/userfiles/files/51244100339.pdfIn PDF document text
    • http://lenosada.sk/editor_uploads/files/tenedamasojewusadipe.pdfIn PDF document text
    • https://cvzona.lt/resources/img/files/37689398230.pdfIn PDF document text
    • http://horvathortho.hu/tmp/50413864918.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/83060658738.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a2fbb0fcaa---rumunoru.pdfIn PDF document text
    • https://xn--80aaa1arbfjoe3bzh.xn--p1ai/data/files/wiluwi.pdfIn PDF document text
    • https://mttrasportisrl.it/dati/upload/file/85391882329.pdfIn PDF document text
    • http://ok-poland.com/userfiles/file/87360162245.pdfIn PDF document text
    • http://ordineveterinarivenezia.eu/userfiles/files/mawewot.pdfIn PDF document text
    • http://braghieriarchitettura.com/userfiles/files/42312145001.pdfIn PDF document text
    • http://thy-environment.com/userfiles/files/mobad.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7f7856a0b---repivisunumiguvedigoxaw.pdfIn PDF document text
    • http://eminenceinc.com/userfiles/file/14994786409.pdfIn PDF document text
    • http://vagtteam.dk/userfiles/Files/sorene.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/e5flc5t699dnru28o3iomt9mh9/79395405830.pdfIn PDF document text
    • http://peggylittlelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/50733498862.pdfIn PDF document text
    • http://administratieindex.nl/images/uploads/15313574662.pdfIn PDF document text
    • http://hamkr.com/userData/board/file/gipovejazunawe.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/12248220314.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/lrqm868d1cghh60pjh0u0pbr58/71515972039.pdfIn PDF document text
    • https://dailyiat.com/html_upload/file/63712961913.pdfIn PDF document text
    • http://hophungvietnam.com/app/webroot/uploads/files/35223356283.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+create+own+vpn+server+on+androidPDF 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_off0000e369.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE369 16728 bytes
SHA-256: e49eda1ce3873de95a9a1ac6847c426634ca8427b9c5711bfef7c064121b8bf8
font_01_sfnt_off00010f30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F30 10604 bytes
SHA-256: 99487dc4db961a8883ded729b37fbda447c19f8532b88159f37b3cb0c3ae607a
font_02_sfnt_off00012793.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12793 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1