Malicious PDF — malware analysis report

Static analysis result for SHA-256 f123f8c083dce921…

MALICIOUS

PDF

82.9 KB Created: 2021-09-07 10:12:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 032e55ad8c62373e0b6481c2be2b6e73 SHA-1: 6e0bb58c271892594038c5c5411816d63d7dda8a SHA-256: f123f8c083dce921bba5b8b579e2f9a94867d9f3b4c8d3a666b172bc437f21b0
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, indicating it likely exploits a vulnerability or serves as a phishing lure. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload storage locations and other disposable hosting sites. These links are likely intended to host malicious payloads or facilitate phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://balade-pierry.fr/userfiles/file/budisojagozeb.pdf In PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f4067e9098---19842832092.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160ab34fe67d09---pixuxetifugoriwapif.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/zejanuvudix.pdfIn PDF document text
    • http://myarrahnu.com/mo_images/files/70501515773.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/19e79ce1b1ef2a78631a309753395392/29927986815.pdfIn PDF document text
    • http://wsmr.us/userfiles/file/73433758688.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/riwisimubojorazudomefilug.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf4d773984---42501805312.pdfIn PDF document text
    • http://vallovin.it/userfiles/files/33652175392.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/zosasabatelafewuzu.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/34c5f091459b53731c4999ae6b4932af/winuf.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c99227f3dd2---sekege.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed85776d86---74893108417.pdfIn PDF document text
    • http://rivebistro.net/ckfinder/userfiles/files/megenekaribobixagatonepu.pdfIn PDF document text
    • http://nanobubblevietnam.com/uploads/userfiles/file/kakuju.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f68ccbfc53---tatibumaxipez.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/8522d45cebe2c6b45dbdc5257e5843c4/85713411353.pdfIn PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210722185318.pdfIn PDF document text
    • http://aokisuper.com/ckfinder/userfiles/files/vaninoxol.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/xipirekawolotidezololil.pdfIn PDF document text
    • http://halmar.info/userfiles/file/66017970502.pdfIn PDF document text
    • http://royalwedding.jp/images/blog//file/68084010593.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=budismo+pdf+gratisPDF 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_off0000dca5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA5 10712 bytes
SHA-256: 084ccd68b91852d44fa455b3f92fbf5ddd7b4b5d04b4d71afd964c8cac6003ff
font_01_sfnt_off0000f517.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF517 19008 bytes
SHA-256: af124ab4783f71e9e45ce844d63f91af254a88d407834cbf98d5a6d789b8ae46
font_02_sfnt_off000125c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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