Malicious PDF — malware analysis report

Static analysis result for SHA-256 f97c548d9b3c3056…

MALICIOUS

PDF

69.2 KB Created: 2021-09-26 20:21:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 878a7c5a3eb2fc9363f9a1d5ed891211 SHA-1: 33fd8f414cc3e055e6167d8e94a58da60e341095 SHA-256: f97c548d9b3c3056e9d6552ea8ff06f91cd4f89fe23dffae3d3418c9697c1146
184 Risk Score

Malware Insights

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

The sample is a PDF document containing embedded JavaScript, which is a common technique for executing malicious code. It also contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the exploitation of PDF vulnerabilities to deliver a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://wastran.ru/uplcv?utm_term=security+master+pro+apk PDF link annotation
    • http://xn--k1akb4c.xn--p1ai/userfiles/file/zoferubutodajibox.pdfIn PDF document text
    • https://purmoradiatoriai.lt/images/files/diwabulekem.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/f93defe71d4b01ba376038d4b1451c2a/vorekefizululij.pdfIn PDF document text
    • https://gplacestracker.com/userfiles/file/pefolo.pdfIn PDF document text
    • https://tattica.byespresso.com/app/webroot/files/upload/files/68219399501.pdfIn PDF document text
    • http://emilybarnes.com/DEVELOPMENT/VERSIONED/emilybarnes/trunk/sites/default/files/file/mujaba.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/4ec63fd7a3169ba4206a1c0db2e4d8f4/suxemesojalabebokeber.pdfIn PDF document text
    • http://szyqjsj.com/UploadFile/file/20210904021918969.pdfIn PDF document text
    • http://olddieselparts.com/ckfinder/userfiles/files/32865312800.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/73241684621.pdfIn PDF document text
    • https://shastriratanchatterjee.com/ckfinder/userfiles/files/54484029649.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/6064494d51ef33b84b79dbf98d337707/sedokifiker.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/33118208258.pdfIn PDF document text
    • https://zzhqhi.com/d/files/ginogiriwa.pdfIn PDF document text
    • http://zenithmetals.com/files/zovodatisegulinepigib.pdfIn PDF document text
    • http://ume.civilkozpont.hu/uploads/file/wizegikiwosemevuwakijo.pdfIn PDF document text
    • http://kcemsp.org/upload/editor/file/31240479973.pdfIn PDF document text
    • https://tebra.si/userfiles/file/xusokutipoxulutirexem.pdfIn PDF document text
    • https://metricgroup.it/uploads/file/venewovagejufeku.pdfIn PDF document text
    • https://inprovitparaguay.com/ckfinder/userfiles/files/fupagowumenoledosixedefax.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c82a9b6344---mibofarovokoj.pdfIn PDF document text
    • http://speed-r.com/js/upload/files/75491632760.pdfIn PDF document text
    • https://facades-et-traditions.com/actualites/file/76740290977.pdfIn PDF document text
    • https://natanashoes.com/kingkong/userfiles/files/xepodijafipovidewelopurur.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_off0000b25b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB25B 14300 bytes
SHA-256: c8056981b715df216db59cb6b9f1c773cbfe08c62a1b85dd1b80d3cd539063e8
font_01_sfnt_off0000d62e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD62E 10768 bytes
SHA-256: ccb887cd107be2fbd8704e45c1c2aaaab1130c0eef9ad60c8de5d64f9563bd97
font_02_sfnt_off0000ef0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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