Malicious PDF — malware analysis report

Static analysis result for SHA-256 5122892a8ac3717f…

MALICIOUS

PDF

74.0 KB Created: 2021-09-08 00:59:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 251e78af4336073a3b19950fd5cf6563 SHA-1: d691693c81cd0bb762a9b53cf7238629a7be6901 SHA-256: 5122892a8ac3717ff47af12adbaca6b52fa0654a61ea151bfaa7f36c5639b834
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. Heuristics identified it as a link farm pointing to compromised WordPress upload storage, suggesting it's used to host malicious content or redirect users. The presence of numerous unknown URLs further supports its role in a phishing or malware distribution scheme.

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://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b7d44819c90---tixirozijukupukoluritepox.pdf In PDF document text
    • http://slphs66.com/clients/e/e6/e62fa13cff665df70d7481f632b33819/File/16124407853.pdfIn PDF document text
    • http://sanga.asia/userData/board/file/29534486109.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/dbc8432dfbd65aa95bb8f3cc7bde416c/jajebusalogewibidobov.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16088eb1e2638b---jogifekawejumowumiji.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16129d6dfd7389---82384092995.pdfIn PDF document text
    • http://leguido.net/files/bulesopilodozazisep.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/17cff9877706ec4555777300b53ddbdd/34062150185.pdfIn PDF document text
    • http://www.optimizecost.com/admin/ficheros_fckedit_subidos/82168927812.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/74a229e2c37224b1ab5b928c7ebf18ab/52819468275.pdfIn PDF document text
    • http://wamer.org/userfiles/file/mezuzusatezo.pdfIn PDF document text
    • http://donghotam.com/luutru/files/gititib.pdfIn PDF document text
    • https://kuepancong.com/contents//files/darudejododejebikivi.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/36489320995.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/aolf030lbrqkues9bc1of1bvag/nokinokefifedirop.pdfIn PDF document text
    • http://kleinschaden.expert/userfiles/file/lalilugemivuzarusipulikur.pdfIn PDF document text
    • http://torgoborud.org/images/file/2523246825.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8ad6d4bfb---xotokamekosowomabuxedatol.pdfIn PDF document text
    • http://heizler.hu/files/file/waxixagudaxelunaginorakaw.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/8fef8a726cf5cd2fe6c0494567d84c37/72867917278.pdfIn PDF document text
    • https://sthouseluxury.com/upload/files/36088303180.pdfIn PDF document text
    • http://aexpress.lv/index/images/up/file/nariresogafumixe.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/54369810261.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f8f18d34192---pumujer.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=paraserianthes+falcataria+pdfPDF 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_off0000bbb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d3c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3C9 10600 bytes
SHA-256: 6637e5fff8043a7d1eee346cf04380b4bc390ddbb2f1b7a6cfeed11d612a4c73
font_02_sfnt_off0000ebe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE1 17984 bytes
SHA-256: 9023c0e9c75677bc47f2eeff2f7607a2a5744686762976f5d340d46ed29aa867