Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1aca56a5be2986a…

MALICIOUS

PDF

95.7 KB Created: 2021-07-29 19:09:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 96a0747da4af47cb61602747fc54b329 SHA-1: dce064f42040829539b31bdb8ebbee0633f827ba SHA-256: d1aca56a5be2986a72b439a79966064fe91fe8d1209b076590cef1ce40577098
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF document containing embedded JavaScript and numerous external links. Several heuristics indicate that these links point to compromised websites, including WordPress installations, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9896

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/db8a09a4b31cc396e99465d832947984/88752355433.pdf In PDF document text
    • http://arlingtonhigh1961.com/clients/e/ef/ef36f0800c0a5d5a0b00d5ecc8c3c6da/File/59126166137.pdfIn PDF document text
    • http://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/27903477500.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b81bf696223---46115781733.pdfIn PDF document text
    • http://bjaimama.com/data/upload/2021/06/file/202106282035196668.pdfIn PDF document text
    • http://signauction.net/userfiles/file/65926609640.pdfIn PDF document text
    • https://ises.ca/phpsites/vertical_living/uploads/file/59752988511.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3295a52427---78829483562.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a013b2be02c---67635486598.pdfIn PDF document text
    • http://richardsonfamilyreunion.net/clients/7/79/79e100fddb184f5a3447a495e7c481fb/File/74269676457.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e692e082a72---muwopivode.pdfIn PDF document text
    • http://amandatour.ru/js/ckfinder/userfiles/files/woxab.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c9df49209ca---kobegizelodisove.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/watewusi.pdfIn PDF document text
    • https://nbretail.com.vn/ckfinder/userfiles/files/zorejejeguxajezaru.pdfIn PDF document text
    • http://moristas.com/userfiles/files/wakedewab.pdfIn PDF document text
    • http://chandravanshi.com/userfiles/file/42424121550.pdfIn PDF document text
    • http://xn--d1achljw0b.xn--p1ai/content/upload/mavonamer.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/e7muudbi7ja1guktrcj7378e9d/zovulimaxavilivo.pdfIn PDF document text
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/fubilazivefuketafej.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/vapefikekiwebitumomefa.pdfIn PDF document text
    • http://developmentassociationofnagaland.org/nbloom/fckuploads/file/pulukamofoximalumesowi.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/55202917093.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160bcb4a0c1320---86558158001.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/narofeboluxunujiguditalag.pdfIn PDF document text
    • http://biomassasia.net/data_ed/userfiles/file/6441126506.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=canl%C4%B1+ma%C3%A7+izleme+program%C4%B1+pc+2019PDF 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_off00010d1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D1F 11248 bytes
SHA-256: 374bdd954b09e9a2d7d0345f0aa30912b82b55ee21a9a26abf72fc64c9b06d2f
font_01_sfnt_off00012723.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12723 18784 bytes
SHA-256: 4883b1ff1cce01b49941221399d2ee0917fb4442295263624d85ec5e1e0bdfd0
font_02_sfnt_off0001554e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1554E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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