Malicious PDF — malware analysis report

Static analysis result for SHA-256 16617400fe932f2d…

MALICIOUS

PDF

78.8 KB Created: 2021-09-16 06:11:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 72aa930fa2ef13799a90199b6d9bd6fb SHA-1: 6e8c0fcacc8437eee0a7be059076e9a889d4f7d8 SHA-256: 16617400fe932f2deb620d5c0339531710f779ae53dd0aa28d63032ae2360532
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm pointing to multiple domains, many of which are hosted on compromised WordPress sites or appear to be disposable. The primary heuristic indicates a PDF link to an algorithmically-generated URL, suggesting an attempt to distribute further malicious content. No scripts were extracted, but the overall structure and heuristics point to a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://studioriboldi.eu/userfiles/files/51558952855.pdf In PDF document text
    • http://potlista.com/file/files/74533224328.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613273e48e0e5---selenolejolinorexob.pdfIn PDF document text
    • https://mama-light.net/business_school/uploads/file/86908231100.pdfIn PDF document text
    • https://mylin.in/ckeditor/ckfinder/userfiles/files/86467380171.pdfIn PDF document text
    • http://geometramaurotozzi.it/userfiles/files/zalenarixizumudesevo.pdfIn PDF document text
    • https://anjingliar.com/contents/files/vowuvidurom.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/latafovegewetomowi.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/xomevirodabujoranotefu.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/72944294562.pdfIn PDF document text
    • https://jensbrode.de/files/file/39979586128.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613ded3392174---95928464506.pdfIn PDF document text
    • http://launensia.cz/ckfinder/userfiles/files/38204647774.pdfIn PDF document text
    • https://advik.net/userfiles/file/fogobotavax.pdfIn PDF document text
    • http://avvocatogiuliani.it/userfiles/files/78273758259.pdfIn PDF document text
    • https://at2-turbo-j3t.com/contents/files/rarugajapofugudunuwelefu.pdfIn PDF document text
    • http://classicalgardenstatues.com/uplds/file/86034625522.pdfIn PDF document text
    • http://ambulatorioveterinariobubiniregini.eu/userfiles/files/rizepabejivadumaga.pdfIn PDF document text
    • https://abcelectricalonlineshop.brilliantwebtech.com/userfiles/files/kutinijibikibonoxedozi.pdfIn PDF document text
    • http://sqc.jp/user_data/editor/ckfinder/core/connector/php/upload/files/74523529497.pdfIn PDF document text
    • http://toptoptraining.ru/img/upload/file/vezawejenasum.pdfIn PDF document text
    • http://kdekdyjak.cz/data/82529861181.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/etoioaedb107v5ccd6185219h0/85389878036.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c341a771e0---8719609427.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141929e4b466---44021454855.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=download+super+mario+maker+para+androidPDF 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_off0000ceea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEEA 10732 bytes
SHA-256: a7f39b01d03c3245dc89d48296fc1fc823e3e8cf86bb633dc8ea1a94d3a90b43
font_01_sfnt_off0000e78f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE78F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ffa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA1 17932 bytes
SHA-256: 71b9cceff7ece6a0d8a46666a2fa112d049130bb0df7be594460e0d497923093

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