Malicious PDF — malware analysis report

Static analysis result for SHA-256 20ba7c8f94ec8357…

MALICIOUS

PDF

94.9 KB Created: 2021-08-12 22:45:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 82e3cee9ea421f6ab3b239fa96eb6ca2 SHA-1: df1240f02b9e60cd0b34b88f04f4e26915c113df SHA-256: 20ba7c8f94ec8357d895db4dc764d1c8a0d93fe66607cd6fd473751a8062918f
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged by a machine learning classifier and ClamAV as malicious, exhibiting characteristics of a phishing trojan. The presence of a fake CAPTCHA lure suggests an attempt to deceive the user into performing an action that would lead to further compromise. Multiple URLs hosted on compromised CMS upload directories and disposable hosting were extracted, indicating a potential distribution network for malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9653

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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 http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607137e998442---17964406741.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e525698974---67559662336.pdfIn PDF document text
    • http://zuche0551.com/upload/file/kupidexibunib.pdfIn PDF document text
    • https://windfreeklima.com/upload/ckfinder/files/33102638257.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/b5697d1ffbf5b8599320b10291e4aedd/webamunaposutezoka.pdfIn PDF document text
    • http://gospel-pour-100-voix.com/fichiers/newsletter/file/dukupekovofejodepibeto.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/zumulowarunupatizivegibit.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070181ea3d2d---linofitezudazifusake.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/110890ad4278e5d11f38427ccdb415cd/dasafivima.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/sf8hgkvic8tr3v57rg529f3gfg/57222732021.pdfIn PDF document text
    • https://98ing.com/upload/ck/files/20210806_123614.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16095f47bf1782---77998332073.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/xelurakukabaxa.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161110f827c72c---12744484409.pdfIn PDF document text
    • http://j1medical.com/uploaded/file/41014646589.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160acf28859c21---pusemerivevo.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f72278a51d7---13886465947.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/31437189926.pdfIn PDF document text
    • http://bygreenpure.com/userfiles/file/90476348828.pdfIn PDF document text
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/96477523534.pdfIn PDF document text
    • https://mmoxx.mn/userfiles/files/bedutemepepi.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f65253ec97---70549275905.pdfIn PDF document text
    • https://ivanamihic.com//files/sowatonozebapowerugasorab.pdfIn PDF document text
    • http://enjoyisagenix.com/ckfinder/userfiles/files/rekakunenimu.pdfIn PDF document text
    • http://anupbolivia.com/images/files/kajipipazim.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c956328383---garupawilusodujogijonux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=need+for+speed+underground+1+for+android+free+downloadPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f822.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF822 10792 bytes
SHA-256: cc645e2a194cf80d76228051b39078de294bf6ef38338c76e9ebbc06830bb09c
font_01_sfnt_off000110ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012910.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12910 16092 bytes
SHA-256: 9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd
font_03_sfnt_off00013e51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E51 17224 bytes
SHA-256: b2c27874a465327a6d5cb9601ff48831559b62e456ab075ca15b983b2ae8fa3a

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