Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ac280ea7f0755a1…

MALICIOUS

PDF

91.5 KB Created: 2021-07-21 17:53:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9e730c4b6f6076f733463e1274ccf207 SHA-1: 7d59b448be9ee1e6839a81e745033d6fc721739b SHA-256: 2ac280ea7f0755a10c28662d3fa2da9847b88456fbd164dd0b6788d848140384
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting it's used for SEO manipulation or to distribute further malicious content. The presence of multiple external URIs and the link farm structure are key indicators of its attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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 https://vibanghanoi.com/uploads/files/76901440648.pdf In PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/mamoxizuvawifukune.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/90103338983.pdfIn PDF document text
    • http://nfc.soo.jp/file/ruxuberotuvagaviwiruf.pdfIn PDF document text
    • http://szrealty.net/uploadpic/2021-6/file/2021061022171573499.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/ckfinder/userfiles/files/rekubu.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/13799969786.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/fa4n4s9r1opbtrbabtp0f28m83/46901906197.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/7899b67ca9d96936e3718ea73e610864/7326577942.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086f67827de1---rufuzozoduzo.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d5bc5db721---jinebijizowazaki.pdfIn PDF document text
    • http://skyfestival.kr/ckfinder/userfiles/files/24418133217.pdfIn PDF document text
    • https://serka.com/serka/upload/files/jawajuwofebakofuk.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/609fd6778f581f247455d94b4d3c035b/kerozutukabi.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/f01dfa8635d9a6d9eef1b65e261bc1fd/20336735137.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/a61e78eda3612060f56d263ad02fd2e5/20131970095.pdfIn PDF document text
    • http://raisemoneyonline.org/clients/6/69/691275cf9a36cab982b2498ebdc715be/File/jupemejaxewakivom.pdfIn PDF document text
    • https://areicon.com/images/file/niwaxifajokad.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/94009967686.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16083702dca395---fogufazem.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1608bf322c2bc8---70087700854.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/ed1f6007b4d95c31d3e18ae33e902793/temovigemuwel.pdfIn PDF document text
    • http://sinproval.it/userfiles/files/zezabogebukaxejawobifer.pdfIn PDF document text
    • http://csc0898.com/userfiles/file/20210706063344_igxjv8.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/7d8f98750fd81f5902fc7790cb611cbd/33413645679.pdfIn PDF document text
    • http://seanmore.com/userData/board/file/30008852653.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=time+and+destiny+quotesPDF 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_off000103e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E6 17052 bytes
SHA-256: 43d16c2d434c583c5b0fbd272aa95594824e29b54f316bf547bfeabcda3153d2
font_01_sfnt_off00012f66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F66 10584 bytes
SHA-256: 97a104bc7613f19fabb255f39016ab68d08fa18c4be6d3b54b99325889a61285
font_02_sfnt_off00014761.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14761 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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