Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef1a28d47a1af297…

MALICIOUS

PDF

93.9 KB Created: 2021-07-10 10:18:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: df67442f5fc572cc8d30dacb748845c3 SHA-1: dbb66e4a24b5dd9f4a625dd24f3e4c0533592a13 SHA-256: ef1a28d47a1af2971ea9359e00db596ae96ee1ce8869f1b418c6c0a9ec223462
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URIs and link farms indicates the PDF is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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://huntic.ru/uplcv?utm_term=we+apologize+for+any+inconvenience+this+may+have+caused PDF link annotation
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/1a44b1d09d9c9c2074122bc284299c0d/voxodasulugukeramafuv.pdfIn PDF document text
    • http://nandeestationery.com/userfiles/files/57547842857.pdfIn PDF document text
    • https://speeddating.lt/speeddating/ckfinder/userfiles/files/99027024899.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160b39ab494531---ziwuvotegaxal.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/sibaduligum.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/353255009ab7fcb4d0ce4bfbfcf4bc35/50668811041.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/807efdc5bd728f7d9ee98e437ac9d425/58484716876.pdfIn PDF document text
    • http://medica-brno.com/files/15481954542.pdfIn PDF document text
    • http://zzliuxue.com/upfile/file///zagazukomomosetomupa.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160732d1c2bf8f---mipugupavasone.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9e3f1698a---goputifosumapi.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/8d49f8a03af124a2bf8808e7a327806c/38054348922.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/cj1s98trq8glk0pgo1gmclfdae/82049292222.pdfIn PDF document text
    • http://spalovnachemolak.sk/userfiles/file/kupufifubu.pdfIn PDF document text
    • https://360clothing.in/home/www360cl/public_html/uploads/images/files/bevedob.pdfIn PDF document text
    • https://landbar.com/upload/files/sobikonalejawozi.pdfIn PDF document text
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/9a6e764b5f212e46e5ccdea053cb8a2a/sarimazekolibuxexonereg.pdfIn PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608291d9154ac---72889852775.pdfIn PDF document text
    • http://www.odnpoznan.pl/fotki/file/file/22906236788.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8732d3b83---2352428322.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e3aa18af92---50513593042.pdfIn PDF document text
    • https://austarpharma.com/upload/files/35452776353.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160774b0cc24be---28606976102.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f718.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF718 3500 bytes
SHA-256: 6a06d804c7cbeb58e72f15992b100fe7148f99c8c13ab7c91fe839bb2c94556a
font_01_sfnt_off0001050e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1050E 18972 bytes
SHA-256: 25ad743ffe11c3c366b9070c53e1368167b8d81059cdde3250d4f1cf86aa932d
font_02_sfnt_off000136a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136A0 11400 bytes
SHA-256: 3e4003102fc2f0728f8a1523be6c16405b167b9e1c5c2e31a65250e4c39b1918
font_03_sfnt_off00015134.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15134 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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