Malicious PDF — malware analysis report

Static analysis result for SHA-256 09d359bdf5480e87…

MALICIOUS

PDF

104.4 KB Created: 2021-09-06 01:14:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 99c94b64a81df258783842cbbacb45f7 SHA-1: e24e06b152394a664c34ffee743ae19fc867b979 SHA-256: 09d359bdf5480e878b04de5ff979554f5537a8365d0c24b78ee34381b9f02e7c
156 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with many URLs pointing to external sites, some hosted on compromised CMS uploads. This suggests the PDF is likely a lure for phishing or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

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://annjulieskarpmo.com/userfiles/file/69644616920.pdf In PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f863f1fb1b---26704171023.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/8593679f5c24bf33c50b91d75fa02ed8/joxujawevipuvesezuwe.pdfIn PDF document text
    • http://studiopedrazzini.eu/userfiles/files/nunona.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/gunasefumunidotalixogag.pdfIn PDF document text
    • http://rolmech-strzelno.pl/Upload/file/75932136875.pdfIn PDF document text
    • http://german-ex.com/83995761296.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/701a11da433cb0a5df6af8b594ae7ee8/razorixuxivumisimigifu.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/nujupibufiroturidafok.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160863081b6849---80637343822.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/molopitegumusofabi.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c2299508e---61046638110.pdfIn PDF document text
    • http://suarezbeltran.com/aym_images/files/4085290590.pdfIn PDF document text
    • http://thailaundry.com/imgUpload/files/60933247034.pdfIn PDF document text
    • https://markmont.eu/editor_uploads/system/files/86720084304.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/20008eff77134ba0ee56901b9e074724/869827750.pdfIn PDF document text
    • http://stonepigments.com/userfiles/file/zofajidifel.pdfIn PDF document text
    • http://jun-travel.com/userfiles/file/37618386844.pdfIn PDF document text
    • http://dispensapertutti.com/userfiles/files/pejuv.pdfIn PDF document text
    • http://sassyissy.com/survey/userfiles/files/dewalejawugalule.pdfIn PDF document text
    • http://startent.ru/SITE/files/editor/file/30336115353.pdfIn PDF document text
    • http://iphonedown.com/ckfinder/userfiles/files/dizasone.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/5i24qiigc81rnmv1m7ql43ss6a/73447048307.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/62074128926.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/qgrof3h1q6bouslfolbe820h69/82364633395.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b169baaa8ee---patixuzetaxukezata.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=manu+dharma+shastra+in+tamil+pdfPDF 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_off00012a75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A75 22068 bytes
SHA-256: 4096ca29eea7e54a2d30381a5ffe44bc588cfc88240ce60884df7a537d2f1a7c
font_01_sfnt_off0001638c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1638C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017ba3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17BA3 10604 bytes
SHA-256: 1e0048832f0383a0e2966db608b5e35a595f8d9b989a4600d2de1cb03f9d9e92