Malicious PDF — malware analysis report

Static analysis result for SHA-256 6824fcfec4aff65d…

MALICIOUS

PDF

81.3 KB Created: 2021-09-17 13:19:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: b0d61c760964221f6d3953292a900e5e SHA-1: cf01b970e26a9ee8251a25c5baf51359f6375f41 SHA-256: 6824fcfec4aff65dd70748144b74f00700d627082edf274f5906ec9feb35e9f3
176 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. These link farms, in turn, redirect to other PDFs hosted on disposable or compromised domains, suggesting a multi-stage distribution or phishing campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132ce1fac435---mupugamanewera.pdf In PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/b89d0128e79e08bfb82a1d13d8a9bf63/difijizeduzuvat.pdfIn PDF document text
    • https://cornerstonelaw.eu/userfiles/file/30945128728.pdfIn PDF document text
    • http://eko-baby.ru/userfiles/file/96870930153.pdfIn PDF document text
    • http://www.icareonline.net.au/ckfinder/icare/files/jutipanupawufetasurorefi.pdfIn PDF document text
    • https://pingthye.com/userfiles/files/lijedabikonufijosuve.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613822139d316---91056135318.pdfIn PDF document text
    • http://185.33.116.145/~acus01/upload/files/kutulawojafuruzukizi.pdfPDF link annotation
    • http://www.xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/75834247767.pdfIn PDF document text
    • http://dichvumucin.com/upload/ckupload/files/65797429110.pdfIn PDF document text
    • http://ministerium.pt/files/jefexi.pdfIn PDF document text
    • http://www.focitabor.hu/userfiles/file/fuzasapi.pdfIn PDF document text
    • http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/25624571111.pdfIn PDF document text
    • http://viral-list-monster.com/ckfinder/userfiles/publics/files/71244656779.pdfIn PDF document text
    • https://hobbypet.cz/files/file/gedibigitar.pdfIn PDF document text
    • http://oishisushigd.com/uploads/files/58958345178.pdfIn PDF document text
    • https://charming-dc.com/uploads/files/202109032159038073.pdfIn PDF document text
    • https://happycondo.leaddeehub.com/userfiles/files/lefosateretigikebop.pdfIn PDF document text
    • http://mehmetrasimmutlu.com/icerik/file/zuponumidexumikeju.pdfIn PDF document text
    • https://mosallaesf.ir/uploads/ck/files/40986970604.pdfIn PDF document text
    • https://luckyfood.itweald.com/uploads/files/613ff1dd4faca.pdfIn PDF document text
    • https://megatekspb.ru/sites/default/files/uploads/tafibituwojifuxujogoxim.pdfIn PDF document text
    • http://www.rupankar.com/fckimages/file/livigexudenazifogaloki.pdfIn PDF document text
    • http://somsit.com/ckfinder/userfiles/files/85833867690.pdfIn PDF document text
    • https://hotelreviewreserve.com/basefile/hotelreviewreservecom/files/sezukurefod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=download+free+porn+games+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_off0000dac0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC0 10828 bytes
SHA-256: 53ae5be005d5a514d1f2224dff76b51ce0115c2e5a241b96a87dd9a5a35e6057
font_01_sfnt_off0000f37b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF37B 17116 bytes
SHA-256: 5ad277b279fd575bfea9a08d1395bf6ae8c5b7753d9637f007427bbcabdc187e
font_02_sfnt_off00011fa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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