Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2c447cd41025d56…

MALICIOUS

PDF

82.3 KB Created: 2021-09-21 06:24:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 07844d486128662fa0bc7c3ab175be7a SHA-1: 48e0bc0c5270e02b13d1ec06b17b29638fb81170 SHA-256: a2c447cd41025d56985c4d840d09746f6b64446a9a6df3daf5ac44730d6d1009
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://philabc.ru/uplcv?utm_term=female+symbol+copy+paste PDF link annotation
    • http://absolutelyneon.com/userfiles/file/48207077976.pdfIn PDF document text
    • https://labelmarket.eu/data/file/papobesopogeve.pdfIn PDF document text
    • https://konzolstudio.ro/uploaded_files/file/gagixivusopimi.pdfIn PDF document text
    • http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/52006518466.pdfIn PDF document text
    • http://midesignvn.com/uploads/files/buxavufepul.pdfIn PDF document text
    • https://hoangvan.vn/wp-content/uploads/files/90929009867.pdfIn PDF document text
    • http://zkmeiqi.com/admin/ckfinder/upfile/files/zujozodofibo.pdfIn PDF document text
    • http://remobudostol.pl/pliki/zoxusun.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613ddb3646351---vitabiporogef.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1614304d09308c---89611135762.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/181c492b9245a9aac9dfe19f243856b3/29992551522.pdfIn PDF document text
    • http://sanphamhanquocymy.com/uploads/files/41947519533.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/951uobjheirh24e3ujb386tgi0/ralajiwon.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/fesanebe.pdfIn PDF document text
    • http://csc-028.com/userfiles/file/20210903155826_aof4gc.pdfIn PDF document text
    • https://ysh.my/userfiles/file/netokajarefeka.pdfIn PDF document text
    • http://hzbmsj.com/images/upload/File/3552394827.pdfIn PDF document text
    • http://tokyo-sanritsu.com/userfiles/file/vodesexegopotawuvusut.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/teraxevokafovebawo.pdfIn PDF document text
    • https://duvanco.be/docs/files/29341242587.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/e896ad72b34fe28e94d590e0aa3af95a/44640594247.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/1423b796882a9d5f86125afb8c3e55ca/96138417210.pdfIn PDF document text
    • https://casalindasbakery.com/ckfinder/userfiles/files/55303797967.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135f29ea61b3---vifefalisofo.pdfIn PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/72783686966.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_off0000d35f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD35F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB71 21284 bytes
SHA-256: 9befe0eb2008022043bf5c527d30565362c70a383dcc5fe444977cc806a61a84
font_02_sfnt_off00012416.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12416 10472 bytes
SHA-256: 855ab90819d0c4808838018b3e62a873edc1c9a0502628e3777a363c4768ead1

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