Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3f0ef1255740820…

MALICIOUS

PDF

86.0 KB Created: 2021-09-10 20:16:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 769ac44820c896b3870462027c58dcb3 SHA-1: 4634e3ad7571ae64603e3d83505b9741dbc423f1 SHA-256: a3f0ef1255740820be3b1fff5b7e10cf2ee9dacfa274897b5e8ab4f60e4c365a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains multiple links pointing to compromised websites, including one hosted on a compromised WordPress upload directory. The presence of a link farm heuristic further suggests an intent to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://chapelguild.com/images/usr/raserazetaxewabepupubu.pdf In PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16131622b778e7---golefewimanikepim.pdfIn PDF document text
    • https://alpinismbihor.ro/app/webroot/files/userfiles/files/77006231212.pdfIn PDF document text
    • https://360clothing.indicsys.com/home/www360cl/public_html/uploads/images/files/sabatavizofogezev.pdfIn PDF document text
    • http://www.mamafoundation.cz/ckfinder/userfiles/files/87954694924.pdfIn PDF document text
    • http://swaptoys.org/ckeditor/uploads/files/81077588264.pdfIn PDF document text
    • http://queenart.kr/userData/board/file/jexikexe.pdfIn PDF document text
    • http://fkhd.cz/data/img/wigodotugavagij.pdfIn PDF document text
    • https://ltes2.tw-goods.com/UserFiles/files/fuxerelenovogi.pdfIn PDF document text
    • http://elosc.com/upFile/file///ITX202109031021481181.pdfIn PDF document text
    • https://globalathena.com/ckfinder/userfiles/files/momagupesogirekopodibudu.pdfIn PDF document text
    • http://marketingnews.fr/images/file/21553907846.pdfIn PDF document text
    • https://mfdesign.hu/files/file/15369073196.pdfIn PDF document text
    • http://csa.china-led.net/static/editor/ckeditor/ckfinder/upfile/files/vopuke.pdfIn PDF document text
    • https://hazeloyun.com/calisma2/files/uploads/59170844810.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132c48251f3b---16330291556.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/68eoafak06t66ei16lromfpg6d/rixotajaf.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/bewafetevapef.pdfIn PDF document text
    • https://boumqueur-edition.com/upload/fckeditor/file/35107843742.pdfIn PDF document text
    • https://banktapeunadana.com/tapeunadana/bank2/admin/userfiles/file/boxewudibisubo.pdfIn PDF document text
    • https://ra7a7p-h3ba7.com/contents/files/viveretobinig.pdfIn PDF document text
    • http://bretagne.annuaire-regional.com/ckfinder/userfiles/files/17923997014.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=cle+usb+sur+tablette+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_off0000e947.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE947 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001015e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1015E 10512 bytes
SHA-256: 6be9bf26eb8e3ad9a77cea21413d60e579544452e24e3aac1390ec9647e2e27f
font_02_sfnt_off00011968.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11968 19820 bytes
SHA-256: 768a09786c87227139795ba04936f88c19dbe5d4640d3ed69afae7f37ae3ae63