Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2500ca770f82304…

MALICIOUS

PDF

106.5 KB Created: 2021-06-28 18:13:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 2f220c1c33d3b498666dcc5e29ced8d2 SHA-1: 765f743df7d77fe59b6af454af51e77d0d960db9 SHA-256: a2500ca770f82304ac534283244412d3d3a3d84923cf6ca69d77b1055c9eb0fc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is identified as malicious by ClamAV and an ML classifier, with multiple heuristics indicating it functions as a link farm on compromised or disposable hosting. The embedded URLs, such as https://philabc.ru/uplcv?utm_term=jargon+speech+in+toddlers, suggest a phishing or malware distribution lure. The PDF structure and the nature of the URLs point towards an attempt to redirect users to malicious content, likely as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://philabc.ru/uplcv?utm_term=jargon+speech+in+toddlers PDF link annotation
    • http://www.firengo.com/userfiles/files/64789318990.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c928415dbce---lokurozefok.pdfIn PDF document text
    • http://aquatrustfina.com/userfiles/file/sosulupigew.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/21487162529.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/840221440.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e3daf59acc---77206456.pdfIn PDF document text
    • http://ligneus.hu/upload/file/sajarid.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16079959d17c93---notar.pdfIn PDF document text
    • http://africa-emergence2019.com/userfiles/file/58959474876.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/16081b886207da---55558523511.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160793c0779245---54934045437.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b4b3d2ca528---xeweligumepizamifu.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080548d1e047---70391597266.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088b3a7e63f5---tiparuwatebezuju.pdfIn PDF document text
    • https://istocdukkan.com/userfiles/files/8115498103.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/c547dba409f4c11c5a2fd6da381e9d4d/69630652466.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/958acad3c8635598b028b21b2608ef31/96669001625.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/45161e66ff06953e249fcca5ec9ac2ac/pudewexunidos.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/4e1e582a015cd2470f827bee3a619b9b/niteju.pdfIn PDF document text
    • http://jinanxintiandi.com/userfiles/files/49293364836.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f767a4f1c---15743028107.pdfIn PDF document text
    • http://epoxidice.ro/mm/file/dinamudijekifizu.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/lonusafijukobo.pdfIn PDF document text
    • 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_off00013a3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A3D 10784 bytes
SHA-256: ab4fa207c6e224688228d3500fdff1cb03a030c7b34a0d23e28371dcb67cafac
font_01_sfnt_off000152cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016add.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16ADD 18540 bytes
SHA-256: 4c1e2542931cae108b62c0dfbfa198c65b166e58517730351618ca19849bd800

Open this report in the interactive analyzer, or submit your own file for analysis.