Malicious PDF — malware analysis report

Static analysis result for SHA-256 787f9ae1024b2a97…

MALICIOUS

PDF

93.0 KB Created: 2021-06-28 22:25:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c979afabcca03f7053394c882f30b1dd SHA-1: a8885036ddb65441c65aa47039c312e660fc775a SHA-256: 787f9ae1024b2a97349dbdf1ff17f0b4dd33e8e0963b5008ed24261bd9080b05
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external URLs hosted on compromised WordPress sites and disposable domains. The primary goal appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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 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://smidgel.ru/uplcv?utm_term=find+a+tech+cofounder
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160a444b723758---15165744925.pdf
    • http://canxetaianhduc.com/images/file/fodutonovewewobofujuv.pdf
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609febd7128bb---39877583591.pdf
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160c987438e376---natet.pdf
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d394d06acdf---82748062798.pdf
    • https://pima-alarms.net/slicice/file/50232863533.pdf
    • https://ludifrance.fr/userfiles/file/dizogakawexigarutop.pdf
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e0f52402f9---vasuwokuvegadofulujep.pdf
    • https://bodegoncriollo.com/userfiles/file/85345519444.pdf
    • http://esoftland.com/userfiles/file/fevumure.pdf
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/9irinec78g4q2pgbpcer5v0eo7/97186514838.pdf
    • http://precedent.by/_newsite/images_from_html_editor/file/saxuvoze.pdf
    • http://citywideok.com/clients/75789/File/tijaxoduvekuzagaregarabiz.pdf
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/646f527dc1727abd363323b792bf2399/rireso.pdf
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a66602b54c4---senubamobegetifafonukat.pdf
    • http://svsteinfurth.de/radsportfiles/file/10664017038.pdf
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c4ad29d9de7---8976084505.pdf
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a33f16bd719---33155288965.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160968cb14f125.pdf
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/5a180b5005481bff684d6382b318cdec/zamexezilawusojarolorufen.pdf
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/u1fd3al0jg0i35uvm772jmldgs/kujemupanuvamofe.pdf
    • https://farmaciasacoor.com/site/upload/file/1591308160.pdf
    • http://shophouse.info/images/files/5482544053.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001076d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1076D 16792 bytes
font_01_sfnt_off00011f7f.bin
80af20b01a9b45a7bec3cc18b00ba8576aed46d83f7a12c00bafd6a9945b42f1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F7F 18256 bytes
font_02_sfnt_off00014f6e.bin
10ea41880b4796d92adafefbbd364b2c7f8826269a01b44a3931d5d040e74712
pdf-font-stream PDF embedded font (sfnt) at offset 0x14F6E 10436 bytes