Malicious PDF — malware analysis report

Static analysis result for SHA-256 d67c1cada689ac4f…

MALICIOUS

PDF

86.1 KB Created: 2021-09-01 23:07:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 43b9fd840c8942cffdb1e28f343a2206 SHA-1: 485746bcc3b7efa7b94380177c6a48763fa17497 SHA-256: d67c1cada689ac4f1649c489d967957302b13f35d2a90eab16702f36d756b856
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable domains, indicating a phishing or malware distribution attempt. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. The ML classifier and ClamAV detection further confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3b0d74a0e6eb79b7c54cf72ac5e537f1/80572542252.pdf In PDF document text
    • https://greenlakepaint.com/ckfinder/userfiles/files/kogekifudefejobak.pdfIn PDF document text
    • https://ayurmitra.com/files/file/josaki.pdfIn PDF document text
    • http://xedaptheduc.net/app/webroot/uploads/files/81409051674.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c75a0b59de4---84569691973.pdfIn PDF document text
    • https://maggies-handmade.com/UserFiles/files/67714680554.pdfIn PDF document text
    • http://hebertfamilyreunion.com/clients/3/32/3272330ca4c68e8b1120eb7f178c7a05/File/tiwumigabixogozugiw.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/giuk11o4sokboim8a5lg8pg773/tujetajebiza.pdfIn PDF document text
    • http://bptramptour.pl/files/file/52663193903.pdfIn PDF document text
    • https://ijfbacknumber.com/editor_up/52390765269.pdfIn PDF document text
    • https://francois-daulte.com/ckfinder/userfiles/files/57282516952.pdfIn PDF document text
    • https://cherrychile.cl/cherry/uploads/contenido/files/18433733190.pdfIn PDF document text
    • https://namratalakhotia.com/userfiles/files/68820108171.pdfIn PDF document text
    • http://fitsiluet.cz/data/file/19556765784.pdfIn PDF document text
    • http://laclonghotel.vn/upload/files/wojapokagexotaxedunajavi.pdfIn PDF document text
    • http://firmen-bekleidung.at/userfiles/file/dulawilixiri.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/10715505078.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/9r6iqete5q655e4042aq0ku5j6/79435778609.pdfIn PDF document text
    • http://livelyway.com/ckfinder/userfiles/files/kanewogajabu.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/16087f90c50525---zozekubasuwofuweni.pdfIn PDF document text
    • http://kunmobile.vn/files/uploaded/20210823/file/xapagusen.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/1b58c9575f38493eb6ff4cff7aec2963/57604654344.pdfIn PDF document text
    • http://www.haztartasigepszakuzlet.hu/pics/file/wajido.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/zanusemolet.pdfIn PDF document text
    • http://ttworld.hu/uploads/content_files/files/24820820258.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e0a1381f9f---molamafunukejifivazesalod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=thinkin+bout+you+deante+hitchcockPDF 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_off0000e81a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE81A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001002c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1002C 18400 bytes
SHA-256: 04655a460a3da4f350734b96feed0e637ed723a75d8d46f9101b2eaed10bf6e5
font_02_sfnt_off000130ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130AC 10564 bytes
SHA-256: 40a9cd2ce02470a574f897032dd720d1526bd3eabe97c414ce271f39583a5d9b