Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc000c75bf801e28…

MALICIOUS

PDF

76.8 KB Created: 2021-09-07 04:14:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 39d16a595469009294ad7007d8dbf237 SHA-1: e22c7a721088633a1312fb0f4859fef0a8b38c85 SHA-256: cc000c75bf801e28c38b1457e84b44c3090fa76445b1f30174301480970c7809
164 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a high number of embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious content. The presence of a visual download button further supports a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://inwebjor.ru/uplcv?utm_term=klingersil+c-4430+pdf PDF link annotation
    • http://girisimcilikproje.com/resimler/files/nivoxirusobibazivik.pdfIn PDF document text
    • https://office-agglo-larochelle.fr/userfiles/file/wujifotonefejibigewuluf.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/76846965139.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080b3ca9ed0a---balelonowogovovatog.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/tikogizadog.pdfIn PDF document text
    • http://moretonassets.net/userfiles/fisugeterakifipe.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/5gsfc3ra088j3o05frmd9aoug7/71029929560.pdfIn PDF document text
    • https://kindeeyudee.com/ck_files/files/panolapebe.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/zeleput.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/52992103166.pdfIn PDF document text
    • https://mimpiindah1.com/contents//files/wukunemefosumofogojoji.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/gdg933pln3nnih8u4fi68l6fe4/sefulebuliwesufufer.pdfIn PDF document text
    • http://eaupureinternational.com/userfiles/file/zepoxeg.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/1079965800.pdfIn PDF document text
    • http://minerva-collection.net/files/files/2135855113.pdfIn PDF document text
    • http://transporteslaplata.com/imagenes_web/file/90686392684.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/s1665rb29f8oqtqpsfk065r63r/98120573098.pdfIn PDF document text
    • https://biomedchita.ru/imeg_master/file/tevajowig.pdfIn PDF document text
    • http://alliusie.com/userfiles/file/viduwomixudit.pdfIn PDF document text
    • http://www.tramag.pl/upload/file/zonimefuro.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/6d9e528b877adeef0e6198c0040d1677/bevake.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1611b306798f2c---tiseluja.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6352966e0e---gavuvitasezegetokenobe.pdfIn PDF document text
    • https://abicecream.ru/ckfinder/userfiles/files/88922005984.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_off0000c726.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC726 10812 bytes
SHA-256: 73140bfa3d0c7cefd3ea9939daa2434794da59699958e91f48c12e531c75ffc9
font_01_sfnt_off0000e005.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE005 17672 bytes
SHA-256: df42ea361763bb9554e9413751bd2d06efec6a680999d2a54f697160c948b71b
font_02_sfnt_off00010e0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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