Malicious PDF — malware analysis report

Static analysis result for SHA-256 b11be633403cfc48…

MALICIOUS

PDF

78.1 KB Created: 2021-09-02 06:14:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b50401eed880bd46d0b70a876ab15cef SHA-1: ab2f1bd737f8dc9f895141f9aec7dda249d496ff SHA-256: b11be633403cfc48856680598319ad5946cd9fd8fa6e85024b54c8acfd9bada7
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many of which point to compromised WordPress sites hosting other PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated, preventing a clear understanding of its direct purpose beyond acting as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://getampedmag.com/ckfinder/userfiles/files/87386295025.pdf In PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080a935dabcb---66819926042.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160779dcda0602---lufavixulafibom.pdfIn PDF document text
    • http://3qbuy.com/CKEdit/upload/files/jepoziwifebedizugig.pdfIn PDF document text
    • https://kultmotor.hu/images/files/nonobiresuwes.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/9v3h4kcjaoo2eq82s1rbb9jkr2/kokapan.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/57fur39i0gorl6d14mhp9fcs97/60403030121.pdfIn PDF document text
    • http://simkoongschool.com/uploads/editer/files/vexuxoxusalabewuzefurinu.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/smk084rgv9avcagj9em50orug1/jijupasonisovuko.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/4ae78ff656f514516ceb7c8cecf5b9b7/96840929480.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/62097455081.pdfIn PDF document text
    • http://ux-school.ru/files/files/18856410405.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b601fb9c77a---vexugevexagegun.pdfIn PDF document text
    • http://energy-labels.com/userfiles/file/tijuzofujetiriromolit.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc469e85ad---38434419714.pdfIn PDF document text
    • http://dobrasekacka.cz/userfiles/file/mefinilasidulumuxabe.pdfIn PDF document text
    • http://becucci.it/userfiles/files/mobuzuwutofumo.pdfIn PDF document text
    • http://mientaytourist.com/uploads/files/satogabape.pdfIn PDF document text
    • https://htapigroup3.com/contents//files/31980044016.pdfIn PDF document text
    • http://primavera-bio.cz/userfiles/file/82958215251.pdfIn PDF document text
    • http://standardamulet.com/files/files/46686394268.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/7ece9eebd69f95a3f905858539cf9475/lipagugezojepavitobogim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=burger+well+done+tempPDF 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_off0000cd93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e5aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5AA 10552 bytes
SHA-256: 7a4ee0a202834e0fdfd075e346654e7b2ebfcaab9fb1d2d913b324f54b3eb7e1
font_02_sfnt_off0000fd85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD85 17756 bytes
SHA-256: 39639601f23f09ed213c07ed0bbdde369da8c1ac6bdcffa37a27f1ddb49b2f26

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