Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8a0f956cac9e230…

MALICIOUS

PDF

90.2 KB Created: 2021-09-05 08:17:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1a1309830bbb4f8813a67506f4658c9e SHA-1: 2a9869bbdef5fa3c3878aed25d79e29666017527 SHA-256: d8a0f956cac9e230b159f9a5c4bc9e61e02a065c80fa9a4f41a0a2df299cc22f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised websites, many of which are hosted on disposable domains or use UTM parameters, suggesting a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a phishing lure that attempts to trick users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9867

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=writing+task+1+practice+pdf PDF link annotation
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bc2ab65503e---zetizi.pdfIn PDF document text
    • https://garyjetcenter.com/wp-content/plugins/super-forms/uploads/php/files/93d30b99c429c18d9a9c27540f0eafd6/rizokodonefej.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fbd2a057ed---vamimawizofudewuvaz.pdfIn PDF document text
    • http://sake-tori.com/images/library/File/joxosawugokizojewago.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609e4f1932747---banegotewik.pdfIn PDF document text
    • https://cape-electronics.com/media/file/nelinikevurege.pdfIn PDF document text
    • http://toonesk.com/upload/mopabutozogepupinurul.pdfIn PDF document text
    • https://www.chablis-gautherin.com/ckfinder/userfiles/files/bozixefezozul.pdfIn PDF document text
    • http://szymonadamczyk.pl/uploads/fck/file/59388652357.pdfIn PDF document text
    • http://cableesmaltado.com/d/files/xezesedo.pdfIn PDF document text
    • https://psg66.ru/admin/ckfinder/userfiles/files/89299802255.pdfIn PDF document text
    • http://studiotecnicodama.it/userfiles/files/bubezak.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/xetiwupozizul.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16088333d503d5---ririfiponidilexud.pdfIn PDF document text
    • http://abwcoliseum.com/uploads/files/93000424771.pdfIn PDF document text
    • http://rlangkhan.com/upload/userfiles/files/99352955414.pdfIn PDF document text
    • http://acudrved.com/ckfinder/userfiles/files/waxezinano.pdfIn PDF document text
    • http://cosmickino.ru/sadm_files/pesag.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/1607f476b9357a---55771521064.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/3b0dd62716e08b8748262f58d7643fa3/saladekogiludewijegi.pdfIn PDF document text
    • https://leifs-auto.dk/images/file/lediseriwugojere.pdfIn PDF document text
    • http://freeski.hu/freeski/file/82758605610.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/70fluafg0rr3u8jgfc6s8fqj4l/23929162666.pdfIn PDF document text
    • http://amy-tsai.com/images_express/userfiles/files/10863695624.pdfIn PDF document text
    • http://tajesink.com/Uploadfiles/files/94504413556.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/11c70c28fd4b09c9cdccb35a27a30c7d/nenubepetuxop.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000f897.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xF897 17816 bytes
SHA-256: fa30fa674f7875140623aa45d62958ca6b4c7d7a886d85b51efb9b9887791971
font_00_sfnt_off0000e086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE086 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011431.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11431 10764 bytes
SHA-256: 4dc82e2742ee75c3724b97f81f09469751c8a5d8118bd1e824a27386a4b0835e
font_03_sfnt_off00012cf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CF5 17492 bytes
SHA-256: dfba04898f1517ad943c157e5be23bb8532b182032ba8ba50b199a36e5e1e318

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