Malicious PDF — malware analysis report

Static analysis result for SHA-256 c324deae0de78535…

MALICIOUS

PDF

82.3 KB Created: 2021-09-05 12:34:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: fbc714accf756ecfa901a70c2588ba6f SHA-1: 8de14e34a0cfb5bee98e1182a7fc5f231745b4b8 SHA-256: c324deae0de78535d8e5330c9f56b05230f3036f3e58d0a87eb4f92ba78811d4
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to various websites, many of which are hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct textual clues, but the heuristic firings and numerous URLs are sufficient evidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/c9nblshsrrjmrmg360s6a8ncu7/23917177298.pdf In PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c4ddf66e79f---dininusepoluka.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/r51a9vv3t6l8jv3fu3dfiaedjd/7252814304.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/4e49553cc5cf44de470f57024b8ffca5/wizof.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609d5487bd369---zalamivivopatalekejosu.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aadf4f85261---86658233131.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/ukpghlqc8rok6goi0nlm7cei8c/pakudiwakotup.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/retokisugulagukojij.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092395bebe22---xokaxedebugadevekodamik.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/d8c0fb64f8ff057dd0bd052cda042b9c/zinoxukexazofuruw.pdfIn PDF document text
    • https://nusbetaja2.com/contents/files/74366992120.pdfIn PDF document text
    • http://remobudostol.pl/pliki/dofan.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acc2a4abc31---23528376634.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c27d551d9---12995932593.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/880e9fa93a46920c31229fb31eac4cbf/96187931851.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/54822637751.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7962a7bc02---55306531557.pdfIn PDF document text
    • http://sanmarinreunion.com/clients/c/c0/c0747301521b2fcd71a0106c9132c7e7/File/27313565088.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d8047595dc---fopelojirikubawipiri.pdfIn PDF document text
    • http://elitk.ru/_files/32945106777.pdfIn PDF document text
    • http://korean-school.hu/hangul/userfiles/file/36563107712.pdfIn PDF document text
    • https://funbugs.ie/files/file/97390795330.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=pdf+compressor+online+free+to+300kbPDF 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_off0000dc72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC72 11148 bytes
SHA-256: b350fd901f780074aab6e650d769789af55becbee97b403f5d149ce3e2e20e28
font_01_sfnt_off0000f63a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF63A 17364 bytes
SHA-256: 47131b8e827af5714e1bef765fd96fd67e8f46453f2f708088e9cb88eb77c977
font_02_sfnt_off00012348.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12348 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.