Malicious PDF — malware analysis report

Static analysis result for SHA-256 27b96f650493dee9…

MALICIOUS

PDF

94.1 KB Created: 2021-07-20 02:04:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 27426da929e8dc178134f87577007f0d SHA-1: ad9c92005c160fab23fd911bad81b64b31f3c8bb SHA-256: 27b96f650493dee931dc79f65a02ac2d96f33b665e0cce8fce4879664031e945
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, a technique often used to host phishing pages or distribute malware. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of a link farm on disposable hosting further supports a malicious campaign, likely aimed at tricking users into visiting harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d99a9b9a6---nefutumagilafegututunojez.pdf In PDF document text
    • http://usateatop.com/_upload/files/91345543228.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-2/20210502032532238908.pdfIn PDF document text
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/1dd4a2a9ad98d482e879a7140b7eca1e/17873960321.pdfIn PDF document text
    • http://bscartridge.com/pic/jugeveluzupokipu.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/29430346825.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/97469460031.pdfIn PDF document text
    • https://tahitotfaluovodak.hu/ckfinder/userfiles/files/wunonoxufija.pdfIn PDF document text
    • http://piri-piri.pl/ckfinder/userfiles/files/beduzosu.pdfIn PDF document text
    • http://chi-kara.net/userfiles/file/rujevesazuboxef.pdfIn PDF document text
    • https://baigiangtoanhoc.com/upload/files/50443811113.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079670ebea45---61596430415.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160764e5f68143---22304938460.pdfIn PDF document text
    • https://cicadit.ro/UserFiles/file/xajilafin.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a5c0d96032---xoseves.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/f2jec44sri84k8rc08isdbfbpv/88691874445.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/55b2e1c04da40659976a275da90f2a91/gijerokujiz.pdfIn PDF document text
    • http://okzawidow.pl/img/upload/files/87345889508.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16099e9f669b79---84868683670.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/37a0abce7bfe6c222a7829ea54a8ba00/30388125070.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609475136656c---temuxeruzikutud.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/zupozukaje.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087bd23e14b2---82043806282.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607f008e86539---82150075685.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=persona+5+ace+examsPDF 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_off00010d30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012547.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12547 10392 bytes
SHA-256: d2d28bb6a3f389e89b4f03e178324e29b374abb47979c8072e2870ae45fb8438
font_02_sfnt_off00013cde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CDE 17636 bytes
SHA-256: 776a84ed0094ef6922ea0b3f6c6902935d31cd7cc307f1826f59e05ad0f0125c