Malicious PDF — malware analysis report

Static analysis result for SHA-256 770b5fb8491e329b…

MALICIOUS

PDF

82.4 KB Created: 2021-09-08 07:46:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 08ff5f041710f690911a84a84db68338 SHA-1: 170ec1c7c98f5969ddc4e44d6f30cdb23a462b4a SHA-256: 770b5fb8491e329b6a8b39af45d8b80773baf14843a1bbc77d1185104378f777
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, providing no direct content clues, but the heuristic firings strongly indicate a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://saveursetsavoirs.fr/image/file/5054607306.pdf In PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/wigasexurobuxetibex.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607411539367a---13776659506.pdfIn PDF document text
    • http://capital96.com/userfiles/file/vevefifofajaroteredimem.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/bdbe569626d90538118a873143944989/xulupibebafejug.pdfIn PDF document text
    • https://mvpartners.be/images/uploadedimages/file/mujutuniwisuruteluno.pdfIn PDF document text
    • http://aurastaffing.es/upload/file/58619685946.pdfIn PDF document text
    • http://3gr-group.com/ci/userfiles/files/meleg.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4d72adabf---80435221939.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/jagol.pdfIn PDF document text
    • http://janandpoos.com/clients/872640/File/37363752869.pdfIn PDF document text
    • https://gbagencement.fr/uploads/file/xazuk.pdfIn PDF document text
    • http://studionegrelli.it/userfiles/files/44408954570.pdfIn PDF document text
    • http://erictex.com/ufiles/files/50775263103.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed1be3ef97---doduzofawosesaviz.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/54452727235.pdfIn PDF document text
    • https://mygoaltv.com/ipp/images/uploads/files/18189268613.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/c9f226clibq75jo3oskrm2h949/mezuzikodesilubilux.pdfIn PDF document text
    • http://imailbox.nl/images/uploadedimages/file/74569115937.pdfIn PDF document text
    • https://steammining.com/userfiles/file/dakotojoxosotemiriwime.pdfIn PDF document text
    • http://coytex.net//ckfinder/userfiles/files/44332980601.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160853ae27fb7a---fimiwapojarizuz.pdfIn PDF document text
    • https://sportyou.fr/ckfinder/userfiles/files/komemofaj.pdfIn PDF document text
    • http://oilandgaswork.com/userfiles/file/44436605006.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/g5kmjbmvkol88a3vsrun242kcs/lukewazen.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=hindu+death+rituals+pdfPDF 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_off0000dfbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFBC 17140 bytes
SHA-256: dfb3a3320bf772fd7996e43dccc1419260b7dbf7b46d997a7c187ca22ae34565
font_01_sfnt_off00010bc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123D9 10568 bytes
SHA-256: b5f747333a7bd58f5bee93cd0f3411d7bd1b35f9437c25e0afba488128de61a2

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