Malicious PDF — malware analysis report

Static analysis result for SHA-256 93a4ccf5200d911c…

MALICIOUS

PDF

84.4 KB Created: 2021-07-15 21:32:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 82ab71d6bd352712bdf1116786a03e67 SHA-1: b75936bd8dc8be2da2f21f1bd45d7836cd991f71 SHA-256: 93a4ccf5200d911cfcfe7e39138754022c6732d50bfed827af7b72d410dadc76
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs, many pointing to compromised WordPress upload storage and disposable hosting, suggesting a link farm designed to redirect users. The PDF structure and embedded URLs are consistent with phishing or malware distribution campaigns.

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://crysiq.ru/uplcv?utm_term=belly+fat+over+60 PDF link annotation
    • http://zhengfutz.com/v15/Upload/file/2021516211226579.pdfIn PDF document text
    • https://pearproperties.in/userfiles/file/63887537554.pdfIn PDF document text
    • http://ruihuitax.com/files/file/fodulat.pdfIn PDF document text
    • http://rasciindia.com/firetech/ckupload/files/19224060834.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/9aq2stroidha78vp6g72gutvca/67009984495.pdfIn PDF document text
    • https://oklasik.com/ckfinder/userfiles/files/ziduz.pdfIn PDF document text
    • http://studiofapas.it/userfiles/files/74517641999.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/3716787cc8e6fdd2d4465146369180d2/52368759689.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/peksj6dqhfjgv1njdkefvoicho/goxapob.pdfIn PDF document text
    • http://campbellelectronics.com/uploads/pulozaxib.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/45947422062.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/7d1u8apae1ou10cfg6tg43thtm/sojofozifukuw.pdfIn PDF document text
    • https://tonitomov.com/picture/file/58113820915.pdfIn PDF document text
    • http://ahsaipu.com/v15/Upload/file/20214291431253930.pdfIn PDF document text
    • https://craftsmancuttingdies.com/wp-content/plugins/super-forms/uploads/php/files/rdjmrj2kblmtbsa0b9au701c1t/20346004356.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7704b5e412---65661313329.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/064b2a3dc8945aeb3a8991de5bced601/48350616438.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/tdk1ribl8qbj8oghrtmoui6qrt/78888053826.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/c62897ee7b2ae5709641bd2c2852644f/10123798512.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16098f7a807e99---tebimabaz.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160885299f11f9---tosejolomomifuzilag.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160c86054a4896---70469663338.pdfIn PDF document text
    • http://orthopediedelft.eu/files/79206863730.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/nhidtd2fckq84hnqrmda7cn5e1/56679405871.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_off0000e8dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8DD 10368 bytes
SHA-256: 80fb174645f5b855c2493f8c32091f5903f50d196081c5e63aacdf3abd9c31dc
font_01_sfnt_off00010093.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10093 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000118a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118A5 16924 bytes
SHA-256: 19ec94136774884b09555905a23236456d847773d3c4a8af71f956276c1ef67e

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