Malicious PDF — malware analysis report

Static analysis result for SHA-256 84b0a722d138b614…

MALICIOUS

PDF

70.6 KB Created: 2021-07-18 23:27:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 0269eae9886c2909cd48c0bf66bc2341 SHA-1: 5831c696280048af3f57398cef07754326a00922 SHA-256: 84b0a722d138b61492927672d491a8875bd1046d67a8145a7d03434d0cb11f37
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan PDF. It functions as a link farm, presenting numerous URLs that point to compromised CMS upload directories, likely to host further malicious content or redirect users to phishing sites. The presence of multiple distinct hosts and the use of disposable hosting patterns suggest an attempt to evade detection and distribute malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eb41893ad5---tewukikojazepilejepabi.pdf In PDF document text
    • http://cpgny.com/userfiles/files/38157431214.pdfIn PDF document text
    • http://ozgu-yapi.com/firma/files/55405769577.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/b9243d96a3f7e81c6979614de9d5d2df/jimebugesikejufeb.pdfIn PDF document text
    • http://luxe-pools.fr/i/File/foniwupewetoxexepidimisut.pdfIn PDF document text
    • http://recviem.ru/img/upload/19514681319.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/0d312e7025733beed112d5c3895c58f1/27049986745.pdfIn PDF document text
    • http://kartinatv.org/uploads/files/pojebuvalike.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f34207adf7b---28203316854.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/56804845910.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/55f436848f57a9d7abb1a7c4425edf78/rukezukusokobavemuxuvo.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/31464103907.pdfIn PDF document text
    • https://rimsball.com/ckfinder/userfiles/files/xavodujupenig.pdfIn PDF document text
    • http://aweibel.com/Photo/file/21553721993.pdfIn PDF document text
    • https://scalper.ir/data/files/file/xunakasanakofuzu.pdfIn PDF document text
    • https://hyundainhapkhau.vn/upload/files/murubaz.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16084264d382d2---fevab.pdfIn PDF document text
    • https://ises.ca/phpsites/vertical_living/uploads/file/16351075187.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/6lhl859t46tj392jo97q67nhe3/28482985576.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b5a0388917c---49480375770.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/3d57013ef7811dd3b8d7a51d7d5cf5a2/zijomonozewo.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1609a213b89667---56317423308.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a9cc84a46---7872969185.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=what+is+not+a+simple+machinePDF 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_off0000b72e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB72E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF40 14556 bytes
SHA-256: e87ebbb7c0b085f5b2762ea31a95599119394b06935102d42cef570cd657777a
font_02_sfnt_off0000f3fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3FA 10532 bytes
SHA-256: be25c134d259eac219bd14a90af31422351b198a167a587ede0d8f08c060f577

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