Malicious PDF — malware analysis report

Static analysis result for SHA-256 a915980bc2cfeae5…

MALICIOUS

PDF

77.6 KB Created: 2021-09-03 19:56:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0e7f79cf9a85689f9819b5cd5849d4fe SHA-1: 7d6f9556b8a95df86791a31a354789c97b7a4192 SHA-256: a915980bc2cfeae56ba9ffa907e851cab97e6b25c26bcedfff0f28d9ac729d4b
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URI links and link farm patterns indicates an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://tostonet.cl/ckfinder/userfiles/files/bezitag.pdf In PDF document text
    • http://dmhu.eu/uploads/uplib/file/tararujelovab.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/sibakixudamokif.pdfIn PDF document text
    • https://trotusgrup.ro/ckfinder/userfiles/files/xexufunap.pdfIn PDF document text
    • https://ourcampuswindow.com/ckfinder/userfiles/files/padazovetixuzad.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/49ee4391890c9398e1c94e675d5a821e/vonaladijizeri.pdfIn PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/4185670865.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/c207d3ce07e6de0c330f5999b40f34c8/23394528392.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c7a6b6a5959---videdobebujowide.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/52936269578.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160860fe59930a---nuvesujoval.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609697f315d5c---gufifosijixigusogopu.pdfIn PDF document text
    • http://honghuibio.com/d/files/84959644256.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/36309530590.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e86aab58804---rufapo.pdfIn PDF document text
    • http://innovatepc.com/userfiles/file/88170172706.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/7mscuiev75nkbn58fdni7m3vkj/27096984140.pdfIn PDF document text
    • http://tafgambiatours.com/userfiles/file/xepeduj.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607982eda8e53---89425900921.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/f6c4ebbb765fc2988de6c364897cd872/wuserezudofowenorodisuzi.pdfIn PDF document text
    • http://kurdumovldpr.ru/uploads/files/3043491061.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16074cfb48857d---87073133025.pdfIn PDF document text
    • http://klccpa.com/userfiles/file/3162472614.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=english+to+fijian+dictionary+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_off0000c92c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC92C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e143.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE143 10992 bytes
SHA-256: 6bb950ae9b6b6edbdb9c69ef57635b941dc8ce090110684370f6b6725d269d1e
font_02_sfnt_off0000fa7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA7B 17820 bytes
SHA-256: 44e9de7f9c0d28fc936caae54bdbee0fecb2c317d0354bd4059ef78b245ab2c7

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