Malicious PDF — malware analysis report

Static analysis result for SHA-256 35ea6ffd7490b8b1…

MALICIOUS

PDF

82.3 KB Created: 2021-09-08 14:53:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c422da4cf65e99fb829ba7e6af9a7652 SHA-1: 9a6f5d9bb9d643ef2c865ba08d5d89e7bc2fd37b SHA-256: 35ea6ffd7490b8b1229fe76ec139ce0742bd98fcdecc8ed32f86ddea7b8e69f2
176 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The 'SE_CALLBACK_LURE' heuristic further suggests a phishing or tech-support scam pretext, aiming to trick users into interacting with the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://salman-is.com/userfiles/file/4368404736.pdf In PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16132529cabbd0---18312787571.pdfIn PDF document text
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/pupakagodejuzud.pdfIn PDF document text
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/duvawakoxovuse.pdfIn PDF document text
    • http://homokkepek.hu/editor_up/vozuginitojuvutuf.pdfIn PDF document text
    • http://spzpoz-zdunskawola.pl/upload/file/14183483616.pdfIn PDF document text
    • https://itracmediav5.com/ckfinder/userfiles/files/61028988833.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/42056968952.pdfIn PDF document text
    • http://www.prctech-th.com/ckfinder/userfiles/files/37134639628.pdfIn PDF document text
    • https://underworldgear.com/admin/images/fckImg/file/famupotamivalonedufiges.pdfIn PDF document text
    • https://korankertas.com/contents/files/28933329562.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/3af1bff6db630de6d759692e5db4e4a7/39568200328.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/29d76e76c94111c94af7ad5748895100/37195803802.pdfIn PDF document text
    • https://wct.goldcrownresort.com/magazine_files/files/jiberigajejeretufon.pdfIn PDF document text
    • https://pepinieramontana.ro/ckfinder/userfiles/files/99151658159.pdfIn PDF document text
    • http://www.mousumibanerjee.com/fckimages/file/36932979059.pdfIn PDF document text
    • https://chambres-hotes-aube-bleue.fr/userfiles/file/70560064860.pdfIn PDF document text
    • http://cu-mbc.com/ckfinder/userfiles/files/11699961190.pdfIn PDF document text
    • http://adidravidar.com/ckfinder/userfiles/files/jojevavaz.pdfIn PDF document text
    • https://ofly.om-digitalsolutions.cn/upload/files/lugopo.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/dedud.pdfIn PDF document text
    • http://sevgineslianaokulu.com/ckfinder/core/connector/php/uploads/files/61143222857.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/05d61c4c9e01fe5e40fd8cead57f881c/dasozulozukusan.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/83302830029.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/5u5u6rmuo301gssqt3j8h72vf4/96880482166.pdfIn PDF document text
    • https://nurdagihaber.com/resimler/files/sobujefole.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=enfermagem+em+hemoterapia+pdfPDF 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_off0000d851.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD851 10716 bytes
SHA-256: 1550eaa03991c11eaf336fbb4d34445b79d47aaaacd7921f4e10184229330010
font_01_sfnt_off0000f075.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF075 19732 bytes
SHA-256: 69d58267c06d2072a1780971bdd25b5802131c1a4d3bffd37fa0bc731b3b7c1a
font_02_sfnt_off0001236b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1236B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1