Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7a1c5122a5dd199…

MALICIOUS

PDF

101.1 KB Created: 2021-06-25 18:00:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 38679f1e42f44e146aa83de862f5c28d SHA-1: 3483b4c42dade97188cb1c82485f94a40bba828b SHA-256: c7a1c5122a5dd19991f19b564c674836d3e0e3c2030e5958fcec5e82c6199e02
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to potentially compromised WordPress sites, suggesting a link farm designed to distribute malicious files. The presence of a password-protected archive lure indicates an attempt to bypass security controls by encrypting the payload. ClamAV detection and ML classification confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9803

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4edcd8832---71593199304.pdf
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/80a944bf4cb8a957446f3c83d6df1d7c/wobigaj.pdf
    • http://ajtoablakcentrum.com/_user/file/divitinasedosokito.pdf
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/baafeaf2d812f66caedac1674c21c1de/sukomopovexowuvijakesekot.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a973ef57d61---20203823372.pdf
    • http://bezagsecurity.cz/userfiles/82632252239.pdf
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b76c6014c16---moromuwuguwewoxasexibavet.pdf
    • https://bursakaynak.com/userfiles/file/57120218306.pdf
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a49ba5d0bd2---fupurabiwirakibunenebebov.pdf
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a84a3de0755---musepenamos.pdf
    • http://rauvuonsach.net/images/uploads/files/xogodorexa.pdf
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f27afaa942---47758840701.pdf
    • http://yournamebadges.com/withyourdog/cms_uploads/file/83162017507.pdf
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f56c0567c0---1172648054.pdf
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd47b73eed---33309960252.pdf
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ab36911fced---wejerigimogutotarovutu.pdf
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608653a9107bc---13839792967.pdf
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609da972efb51---73938566061.pdf
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/e2253efab07d3025c6e144bef5838218/35793469684.pdf
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b46242e4a5f---93962124367.pdf
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/5901ee7fbecdd3385cda502e51e6257e/78949223854.pdf
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/4865aa6da8a7a646f4d5bea1396e0b30/kobem.pdf
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d073db86edf---62961166318.pdf
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/r3c7qajsr3417ooduc8o8gr381/lupulafevuvewilajezi.pdf
    • https://dianthusindustrial.com/resimler/files/zanawamebine.pdf
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/db72b63bce52398ee27ffd06dc6ee2c5/kerofuralanesu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=game+ppsspp+high+compress+2020
    • 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_off0001267c.bin
c1f2ebca03ef9a6e3ab1025eef26018933e0669182d144d6890f60213d89258c
pdf-font-stream PDF embedded font (sfnt) at offset 0x1267C 17928 bytes
font_01_sfnt_off00015583.bin
94350eccf7568c6155af2043d3df6b188891764d6d420ecbe69d654d3d0401f0
pdf-font-stream PDF embedded font (sfnt) at offset 0x15583 10856 bytes
font_02_sfnt_off00016ea3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x16EA3 16792 bytes