Malicious PDF — malware analysis report

Static analysis result for SHA-256 89fc97c04748d346…

MALICIOUS

PDF

75.0 KB Created: 2021-09-13 21:33:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4b772df4cbf425b71802d0160285fd7e SHA-1: baae94bf5cea8c20975cca01e4d82735c998f6fe SHA-256: 89fc97c04748d3465e936d435a3fd1a38e4154bb796fca740cc63679b32a840e
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to potentially compromised CMS upload storage and disposable hosting sites. The presence of a 'Password-protected archive handoff' heuristic suggests the document is designed to trick users into downloading an archive, likely containing a further payload, by providing password instructions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 http://synhbio.com/upload/files/pejimedowupolosubelosoniz.pdf In PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/9e01fc4bd1ac07463319c48c9e694405/samerufikakobezesan.pdfIn PDF document text
    • http://vesimport.ru/userfiles/file/39587696557.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16134c1124f5c3---33025713184.pdfIn PDF document text
    • http://twtipa.com/upfile/files/2021/09/12/51343592620.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137491a5a4d1---87406337963.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/9f7dcc98c427c4970d187707606ce8d9/32077468506.pdfIn PDF document text
    • http://ebrinteractive.com/userfiles/file/5633328838.pdfIn PDF document text
    • http://duancanhotot.com/upload/files/zipasotuvu.pdfIn PDF document text
    • https://resulgame.com/calisma2/files/uploads/95078257274.pdfIn PDF document text
    • http://newworldss.com/uploads/file/wixuvafiwegizovezap.pdfIn PDF document text
    • http://teamwork-poetschke.com/ckfinder/userfiles/files/38655520154.pdfIn PDF document text
    • http://panova-art.com/files/file/99352764769.pdfIn PDF document text
    • https://lotte-ppta.net/beta/assets/file/44640927937.pdfIn PDF document text
    • http://shbaicun.com/userfiles/file/2021090705044273499.pdfIn PDF document text
    • https://peoplesmodelinternational.com/ckfinder/userfiles/files/34555863854.pdfIn PDF document text
    • http://reflita.lt/uploads/files/jamuvidalibosirusiwev.pdfIn PDF document text
    • http://bisenzia.it/userfiles/files/wusabuva.pdfIn PDF document text
    • https://www.solucionaesp.com/ckfinder/userfiles/files/51789276019.pdfIn PDF document text
    • http://sintniklaas.kinderopvangpimpeloentje.be/ckfinder/userfiles/files/38964822432.pdfIn PDF document text
    • http://leebyunghun.kr/new/upload/board/files/dazigivozadojotafew.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/16139ec240806d---fixemirimizinu.pdfPDF link annotation
    • http://geerhannutpourreussir.be/docs/upload/files/sujekatis.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/d20e8f800a6503cef8c7bd62a43b69af/boxuruvusodewa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+unlock+my+phone+if+i+forgot+my+pinPDF 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_off0000bd9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD9E 18184 bytes
SHA-256: f13a5ea061598e7e179113603227cddf96eb17cc75a14897571a37e97c40d08a
font_01_sfnt_off0000ecf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010509.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10509 10980 bytes
SHA-256: 26647a1c46799dea7d374bb57c80c5ae84805ec06b13c968a45edd91934c242f

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