Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5875513980e88f1…

MALICIOUS

PDF

74.9 KB Created: 2021-09-01 20:56:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 683ac4c95a8f586d44e39fcd5739ac9e SHA-1: 4dd4f568dfb2451776d9886bd3ba8006980c57c5 SHA-256: d5875513980e88f1c848fc435d9f5ad4d6cfc1cc0d4c4c5d49b3548dbc336057
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or disposable hosting, suggesting it is designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely responsible for executing the malicious payload or facilitating the redirection to the listed URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://nomylo.ru/uplcv?utm_term=ariana+grande+let+me+love+you+download PDF link annotation
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/945d5641dff84e247e6c1204c1825176/weledemozi.pdfIn PDF document text
    • https://unicorn.mn/js/ckfinder/userfiles/files/83755278439.pdfIn PDF document text
    • http://mgtofubbq.com/uploads/files/nabewanawugimetisen.pdfIn PDF document text
    • https://freshchannels.com/home/sites/freshchannels/public_html/ckfinder/userfiles/files/fukemudirezokegazulenaja.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/zasutelib.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/tajotudefapudejagozi.pdfIn PDF document text
    • http://footstepfloor.com/upfiles/files/29200412028.pdfIn PDF document text
    • http://artdealer.vn/upload/fckimagesfile/cc0b680d6ae2816661e98c25471436b3.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16091cd9a8ffb3---12343704129.pdfIn PDF document text
    • https://pbchistoryonline.org/uploads/file/wibitexagogogus.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/1422311879.pdfIn PDF document text
    • http://sumtinathholidays.com/admin/uploadfiles/file/74521856587.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/7ad3f4af2ce0e65dca29db71ee9d59cf/momumapunajal.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070152def469---8789352913.pdfIn PDF document text
    • http://185.33.116.142/~bbyacht01/upload/files/53943836711.pdfPDF link annotation
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/876bd766f4f48db126625056806fdc8d/xigunadakinexugijako.pdfIn PDF document text
    • http://www.firengo.com/userfiles/files/rudodulotebipipok.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/j21073an7bjkmmloaes5st3ft3/39765827731.pdfIn PDF document text
    • http://iphysiology.ru/upload/botawu.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/24700546250.pdfIn PDF document text
    • http://cs-golfclub.com/ckupload/files/92610433744.pdfIn PDF document text
    • https://trungtammatnamviet.vn/upload/files/30744866412.pdfIn PDF document text
    • http://scvumaichiramen.com/uploads/files/28409784930.pdfIn 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_off0000c4d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4D1 18212 bytes
SHA-256: 86ef6ea798d234897f34eb8000901fc70744446697e8299c6c754eb20acea42d
font_01_sfnt_off0000f3a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A6 10772 bytes
SHA-256: 68ebe4c9119419e72d400de98306ff21c397e4a7440ab84ced72b41fabaaf85c
font_02_sfnt_off00010c46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1