Malicious PDF — malware analysis report

Static analysis result for SHA-256 db157b314a0cb1f4…

MALICIOUS

PDF

82.2 KB Created: 2021-07-07 01:08:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9ee69d5310281bdcb95f4ed36bf71527 SHA-1: 93975ff96470ad2f04e591e552beb67a7e7820fe SHA-256: db157b314a0cb1f4780dc4bbd15da58f9580b99f3d725342984f96edfaf18032
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external links, many hosted on compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely serving as a phishing lure or a distribution point for further malware. No scripts were extracted, but the presence of multiple suspicious URLs is the primary indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://catamma.ru/uplcv?utm_term=distance+time+graph+worksheet+8th+grade PDF link annotation
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160839861b8a23---67798156560.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/ktt915j1p3prqdd9g59bgianel/duduraxatenuvepi.pdfIn PDF document text
    • http://ergo-logo-bamberg.de/userfiles/file/tuzadarebovo.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/47310560202.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/000fbf1fcada468b09cec67225f063e5/59755689666.pdfIn PDF document text
    • https://stopserv.ru/files/file/biwonexobixoz.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/3i4hccbve8cc8iiuks0qrc47nh/69732810295.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/f15075e63f668481767b64056d896932/wesukurebikatedit.pdfIn PDF document text
    • http://jmdfhjl.com/fckeditor/userimages/file/gevolunojawotarotinumapog.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/n949iep2p720ibt1d682p98iud/sefuvowakomibekipi.pdfIn PDF document text
    • https://nguoixunghekiev.vn/userfiles/file/tomoxatoxov.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/61706326586.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/6ee2k9gpvm63ttv0jej6gcogdn/35691731503.pdfIn PDF document text
    • http://liddellgaryfamily.com/clients/863293/File/juzabolerasekikevopa.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16099f5c01c0ff---87441311314.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/sinowuwusisagowi.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/viia4jicsg2msp9umkcj42e0fn/97497699544.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/97554619647.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a6cebb63deb---23635958794.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160842ffbcf98d---nelurewovoxorapug.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078670890ac1---gexajekidanugisekogozisil.pdfIn PDF document text
    • http://asianmosaicnyc.com/userfiles/file/vasonurusojezujedoz.pdfIn PDF document text
    • http://h-st.nl/bestanden/files/mofeboka.pdfIn PDF document text
    • https://vibangnhadat.com/uploads/files/10412594171.pdfIn PDF document text
    • http://btc-ltd.com/upload/file/66653900751.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/5dirnt8o7an88eimgmah1kqh5s/11075715101.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_off0000dac9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC9 11304 bytes
SHA-256: 49695026bb780230b27d7e4d42b034dabfa0ae8a9fe67d90ac3bf6ed21cf507e
font_01_sfnt_off0000f501.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF501 17464 bytes
SHA-256: 7096d80297621353b740301cae8d8a6c6b02c59d1cd36058e236c4b774b2ec1a
font_02_sfnt_off00012302.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12302 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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