Malicious PDF — malware analysis report

Static analysis result for SHA-256 a90ec3a532215e03…

MALICIOUS

PDF

82.4 KB Created: 2021-09-01 02:46:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f08797394c6d8a679d22f525747b18e4 SHA-1: 62517c61272eebc4952c2cd4aed347c0e5f320d8 SHA-256: a90ec3a532215e036dee6f87ebe1c75abd7dbe44b0fe2b83a2713a9f6819c1de
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload directories. These links likely serve as lures to direct users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160803b13c6388---38348888839.pdf In PDF document text
    • http://thedewakohchang.com/image/upload/File/ajofuxepezowebejoguze.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/banakebiwuzolibowup.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/p6sec8rvdctcjaaku5orccgd60/20996510991.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/8140187825.pdfIn PDF document text
    • http://telektrans.hu/editor_up/dogidesumazivewevemezafo.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/0b162cc3cd64131ce72280c130edea07/tidijobemegujo.pdfIn PDF document text
    • http://labradory.pl/file/muxebuvuwozibevab.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fef637ab526---makosiguge.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/71483698636.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/82708232425.pdfIn PDF document text
    • http://iwayman.com/uploadfiles/file/210819131601927697rtvj0a.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/c184f1ba1b70408ca0dcbfd13f1ebd9a/nonubepupasug.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/162033121276.pdfIn PDF document text
    • https://brothers-music.com/ckfinder/userfiles/files/12126877619.pdfIn PDF document text
    • http://elhammagazine.com/ckfinder/userfiles/files/tajovo.pdfIn PDF document text
    • https://forumhrdbekasi.com/webroot/userfiles/files/57394216955.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/ace9835cb8972bed8479ad2eef3373cf/wafujotipirelukadi.pdfIn PDF document text
    • http://clinivetmadonnadirosa.eu/userfiles/files/vigale.pdfIn PDF document text
    • http://youngshiny.com/userfiles/file/1621490514.pdfIn PDF document text
    • https://presstone.hu/userfiles/file/88651433216.pdfIn PDF document text
    • https://cuatudongsaigon.vn/uploads/files/77300422950.pdfIn PDF document text
    • http://studio70.eu/userfiles/files/boxutu.pdfIn PDF document text
    • http://koryosushi.com/uploads/files/lofadanasul.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160707876279e8---lusuraniv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=apartments+in+flowood+mississippiPDF 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_off0000d9af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C6 10724 bytes
SHA-256: 2ecc2c93510d608353fadf2884866340e2f4bb4204cc7d506aef597355d35487
font_02_sfnt_off00010a7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A7A 17884 bytes
SHA-256: cc141a6523e6a3ae5876df027a878fcca42f53ea4ad7c2be1a5c5ece9d6161e8