Malicious PDF — malware analysis report

Static analysis result for SHA-256 c38519466f74f903…

MALICIOUS

PDF

96.9 KB Created: 2021-06-29 21:01:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: cbc7611074c3babdf0172363ad0673c4 SHA-1: ddbab2fd6705c458c6206ea900216a44d40621cf SHA-256: c38519466f74f90352b8f5b5cc00b7534c863f684422e7875ca079cf57e33576
164 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised websites and disposable hosting, indicative of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the embedded URLs and the heuristic firings suggest potential exploitation or redirection to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9806

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://coretry.ru/uplcv?utm_term=word+problems+involving+circles+with+solutions PDF link annotation
    • https://master-service.ro/images/file/konazuja.pdfIn PDF document text
    • https://toolsatool.com/userfiles/files/mutavev.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///2021619141254290.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/775a688ecf7921dd9f612c571032fb8d/witanulixakuj.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/17379068577.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/47111249325.pdfIn PDF document text
    • https://willmarareachamber.com/ckfinder/userfiles/files/pujodixusokusib.pdfIn PDF document text
    • http://whs1979.net/clients/65916/File/widodesitoda.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160a398c536e04---megog.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607beb8512cf8---50967980457.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16074fcda86971---joteposozevuw.pdfIn PDF document text
    • https://vatlieutaphu.com/upload/files/gaxawid.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/tuh3eu51tn57ho7se70c2ik9bg/gepurulinuto.pdfIn PDF document text
    • https://area5srl.it/file/70746228744.pdfIn PDF document text
    • http://blankheich.de/images/uploads/file/milijabebezod.pdfIn PDF document text
    • http://hieuchuan.com/upload/files/bizawakemijewara.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608236603a71b---46894535437.pdfIn PDF document text
    • http://rana-international.com/userfiles/files/pakurewodoponapapefelaval.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/fosumipiwutavupuxafidiru.pdfIn PDF document text
    • https://giovannicaputoboutique.com/file/zifitakiwilowaviwesowex.pdfIn PDF document text
    • http://zs-oilfieldequip.ru/d/files/tasumozolularapuse.pdfIn PDF document text
    • http://yngc.ru/admin/ckfinder/userfiles/files/50076200637.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607faafacb1db---96345989773.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/3c1db92d7e093a2283ede0cfe4d2986d/jomisarab.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160731f647064c---vipivisurelozomunobolevav.pdfIn PDF document text
    • https://rosewoodcity.org/nbloom/fckuploads/file/sanatakefigiwiguso.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/wozike.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010a4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A4B 21764 bytes
SHA-256: 1bcca516b5d0a335398828907226628293b7d027a7826ed0e833dfe99737448a
font_01_sfnt_off0001440e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1440E 11184 bytes
SHA-256: b867777716378a06bce40ef244523e5082d3a49349f365285615efc55b2bba3a
font_02_sfnt_off00015d9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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