Malicious PDF — malware analysis report

Static analysis result for SHA-256 f03a45d7945c7847…

MALICIOUS

PDF

78.5 KB Created: 2021-09-01 20:54:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 740c7167d188de6ded618b5df480c89a SHA-1: aaf54e6c940b709abfd05e1a5bb1fe259cdf1d78 SHA-256: f03a45d7945c7847c3708890d1e6bf1d5eeda5694a9a8147701d59ed9d0231ec
156 Risk Score

Malware Insights

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

The PDF was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload directories and disposable hosting domains. This pattern is commonly used to distribute phishing lures or second-stage malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 https://synerhu.ru/uplcv?utm_term=easy+painting+oil+pastel PDF link annotation
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c46838b01---xotunud.pdfIn PDF document text
    • https://tskrea.com/userfiles/file/koxudiwiziponumamak.pdfIn PDF document text
    • http://gibisch.org/files/files/65504007770.pdfIn PDF document text
    • https://ariconium.cz/webpagebuilder/ckfinder/userfiles/files/42295940847.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/31cadeeed60095296981500027061924/kefalodujitofupijozemasow.pdfIn PDF document text
    • https://echipamente-scule.ro/userfiles/file/74480859237.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/jfer7rnacll17bnk4lldfk5jl9/dezasolepilogu.pdfIn PDF document text
    • http://jungam21.com/upfiles/file/1630475114.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160878bfb92b01---musogilokux.pdfIn PDF document text
    • https://lanna-flyingclub.com/ckfinder/userfiles/files/zuzipixalenavewofikos.pdfIn PDF document text
    • http://residencecarlofelice.com/userfiles/files/muwewijixa.pdfIn PDF document text
    • http://araonline.hu/uploads/file/13879585797.pdfIn PDF document text
    • https://ural-aiti.ru/admin/ckfinder/userfiles/files/49423550546.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b76b2a53071---juvizadepunokejafosoxutal.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7f978617e6---83147992823.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/5a1a4e42de511bb52a86601b44db53ac/45600800633.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/e1ab324e55a0b0bfd5816793abcdfa5a/zeradozaxudovov.pdfIn PDF document text
    • https://ventadeterrenosurbanos.com/userfiles/file/38089138740.pdfIn PDF document text
    • http://patroha.hu/file/fupoz.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/66533196654.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160921fa332410---risogafa.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdcbb79e5fa---35652215178.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/o6ou2m659a6g97jc636a34rqds/ximofonew.pdfIn PDF document text
    • https://nmg.lv/img/uploads/files/pumefenudajuruvapiguzu.pdfIn PDF document text
    • https://aptitudeclass.com/ckfinder/userfiles/files/94858532492.pdfIn PDF document text
    • 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_off0000cf93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF93 17136 bytes
SHA-256: 7ec2425889b1e97da0719334fa5dbaf2e96239e5af8ef6238addd90777c070a6
font_01_sfnt_off0000fbc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000113df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113DF 10424 bytes
SHA-256: 86a6a435ac600b9dd977b8ca0c69b9cbfa475c3d9b9bb527418f2090b68b6d4c

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