Malicious PDF — malware analysis report

Static analysis result for SHA-256 f950eaa0148ec405…

MALICIOUS

PDF

91.7 KB Created: 2021-07-05 02:18:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 4cd0850953c62c4dedee88c08d62fbc6 SHA-1: 543fbbc35699ba303e36b99f1b9b85112161bf5e SHA-256: f950eaa0148ec405ee747e69ef9cdce41aa6378b6f74e6a808069497b48db3b3
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, with heuristics indicating it functions as a link farm on disposable hosting and potentially a phishing lure. The embedded URLs point to compromised WordPress sites and other domains, suggesting an attempt to redirect users to malicious content. No scripts were extracted, but the PDF structure and URL patterns are consistent with phishing or advance-fee scam campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://queure.ru/uplcv?utm_term=communication+and+interpersonal+skills+in+nursing+pdf PDF link annotation
    • https://dgaspcsm.ro/ckfinder/userfiles/files/10682909954.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160825cdcc28eb---jajibusog.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/ed139ea23f2480ba75dd461b9651b0fd/lufevuj.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096179a262b6---56469296079.pdfIn PDF document text
    • https://danielstrehlau.com/userfiles/file/gunukuf.pdfIn PDF document text
    • http://noahsmarinesurveyors.ca/userfiles/file/dodesubovima.pdfIn PDF document text
    • http://qachs88.com/clients/58271/File/tazubunudaredibawi.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16084b61147fd1---70890394771.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/82978803633.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/8a8b7be7c885e4046db35053906d23b7/86703610036.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608971057551b---ruwopivuj.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/f58003e6bb3010cc5febe03395e608ea/87981708264.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/fh7l1aqcs93rcva16pnks5bk55/57877838096.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160907d49a9436---manuzatisetunejamafogawe.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/3slk1gcovl5cjo75t0n8t3760r/10733874414.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021050300482673499.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/jubkg52gtvshv8grvq0dc94qs7/gujuzuforet.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/98467693802.pdfIn PDF document text
    • http://2016montemayorreunion.com/clients/e/e5/e530e98a7ee505477716bae2fe71cdef/File/vukujibenuwulisaxemin.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/16071ea2ab32b4---52842003498.pdfIn PDF document text
    • http://emrc.ie/upload/imagecontent/file/pavexafilokuteje.pdfIn PDF document text
    • http://millecolori.it/images/file/nepowozuwejirujexomunuz.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/raniwikavipenani.pdfIn PDF document text
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/c92d802d6541122b8365b9458f15fad1/45265921875.pdfIn PDF document text
    • https://gencerenerji.com/resimler/files/48914540681.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_off000102cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102CF 16964 bytes
SHA-256: 203d2c81a044e3c302ed4366c14c3213a09a68b069efd8fa24a3a95953cc9d69
font_01_sfnt_off00012efa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EFA 11188 bytes
SHA-256: 964f76652fa3b3179b56ac1514832f8359ee95232a2cb72cac78fd469f29c5e2
font_02_sfnt_off000148f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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