Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf09c27043ba671e…

MALICIOUS

PDF

85.2 KB Created: 2021-06-28 21:07:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: adb9ccec76c1e228c6720dc2666af8f9 SHA-1: 1834d3841417860f6ac6ee6553fa38483a3f05ec SHA-256: cf09c27043ba671e26e62edc9661becf40389bb005c768f4f153d4f7d23b7874
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites hosting other PDFs. This behavior is indicative of a link farm designed to lead users to malicious content, likely for phishing or malware distribution. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ac02fd5a4cc---gibezufewajoj.pdf In PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8b22f220e---raxiv.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/76fea5154c59fbf5e06b85044810789b/sosabulul.pdfIn PDF document text
    • http://primebrokeragetx.com/ckfinder/userfiles/files/lodelixojoserepugolote.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/jovebi.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16075f3f16ae70---80900480392.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16074fa27650bd---wilanuropibazibu.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609b9ca0df2cb---66709400839.pdfIn PDF document text
    • http://honda-vo.com/upload/file/xoxudewilajil.pdfIn PDF document text
    • http://wccflooring.com/userfiles/files/59474323520.pdfIn PDF document text
    • http://tai-group.com/upload/files/37220429396.pdfIn PDF document text
    • http://alphaconsultinggroup.us/vpw/images/file/jekasuzumufalepopejof.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/7714096388.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1607aec5679b77---41314585757.pdfIn PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/12471382479.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091a7e95ec19---20490250597.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982f2c3b3c0---lekajevufizazelanidas.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/fpi2m62bo5ig6qffqmjtmhda45/24528695529.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160721ab26498a---35734192145.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/gupusal.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/fanunesox.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085671267dc6---vizir.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/jimibesexofiponunewiro.pdfIn PDF document text
    • https://hamasataccessories.com/userfiles/files/tikikolomelolo.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7b2d424231---kubitijipezelogavewupuwev.pdfIn PDF document text
    • http://dolphinkorea.com/files/files/taberuvarubomajafi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=structured+interview+open+ended+questionsPDF 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_off0000ebaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBAA 16844 bytes
SHA-256: 896749a3d445ee5da4401d67576040a1802e66152975ce2fadf406a32aa332c5
font_01_sfnt_off00011674.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11674 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E8B 10772 bytes
SHA-256: 6aa7a9df7f8e8411328151ea6cd4fe1f7e3999253215baaa3c79c832651fa559

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