Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4b0be95767e381a…

MALICIOUS

PDF

82.5 KB Created: 2021-09-04 23:04:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6fb16ec9c0c781e7b30229390724921c SHA-1: 6eed64a7e827780a670eccab52ecace7aff08eb9 SHA-256: d4b0be95767e381a73a3684449b3e3a02fdf441de8ef9fe1890409606146f432
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised websites or disposable hosting, indicating a link farm designed to lure users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The document body is heavily obfuscated and unreadable, providing no direct content clues, but the heuristic firings and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://chcial.ru/uplcv?utm_term=physical+and+chemical+properties+of+amines+pdf PDF link annotation
    • https://birudongker.com/contents//files/zekasanowojesidimajazis.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/tutewapaje.pdfIn PDF document text
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/52723006767.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/67839599880.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/734448982ecbd61a7fbd83435320b2d2/mupidurife.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1613390a22d84b---83142775232.pdfIn PDF document text
    • http://lightningriskassessment.com/ci/userfiles/files/rikipewaf.pdfIn PDF document text
    • https://orig-shop-gsm.ro/ckfinder/userfiles/files/41586735237.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/52275959c4e3978976370d7342c3fc49/jugupibizebopi.pdfIn PDF document text
    • http://erisalaw-chicago.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/17202984787.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/d3a5a8c201923dc1b78804637225e87c/46879065008.pdfIn PDF document text
    • https://www.padanguparduotuve.lt/ckfinder/userfiles/files/bafalobol.pdfIn PDF document text
    • http://wowbond.com/upload/Fckeditor/file/joligevo.pdfIn PDF document text
    • http://fotografieindex.nl/images/uploads/lejojukuzaduz.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130a0b38ba84---71810791807.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086659d3ab4a---11255161134.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/vutoxakutir.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d60fe07f19---47792110990.pdfIn PDF document text
    • http://odumakus.com/uploads/files/36404806839.pdfIn PDF document text
    • http://sjanzee.nl/file/80472108273.pdfIn PDF document text
    • http://krikrik.ru/uploads/ckfinder/files/movorefopitizamasunorega.pdfIn PDF document text
    • http://onestep-tokyo.com/userfiles/file/61814526981.pdfIn PDF document text
    • http://unsersohn.com/images/file/vimitizunivubawiwip.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/6a84ab69156f12241a20bf36e7959638/61815738042.pdfIn PDF document text
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/gikamupamirevexura.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_off0000dc5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC5F 11000 bytes
SHA-256: 74cea6ea7b509857e4f214ae787f014372f084249d5a45f6202e9e5f882aed6c
font_01_sfnt_off0000f5be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BE 18144 bytes
SHA-256: 407d3b737cc18c420df777d799b0ca682f5ee6b860957fcf711402079338d343
font_02_sfnt_off00012395.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12395 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.