Malicious PDF — malware analysis report

Static analysis result for SHA-256 890b3039047a67c6…

MALICIOUS

PDF

71.4 KB Created: 2021-09-26 00:27:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2b15875383c69d0b2a60958ab32df357 SHA-1: 861140747c52436a7d1d2e7f19c113e1ca2bfae0 SHA-256: 890b3039047a67c6d8dc22ff8e3a70b798c47986c4f3d5a7daf22b0cb225bf19
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs likely serve as lures to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://smidgel.ru/uplcv?utm_term=chug+jug+with+you+roblox+id PDF link annotation
    • http://indagosrl.it/userfiles/files/wewenukavu.pdfIn PDF document text
    • https://livnica-metalurg.com/images/pages/file/2887295155.pdfIn PDF document text
    • http://xn--80adic7alej3d.xn--p1ai/userfiles/file/purenomumu.pdfIn PDF document text
    • http://clinicaveterinariamontecchia.com/userfiles/files/84511081337.pdfIn PDF document text
    • https://autoradiator.mn/uploads/ckfinder/files/likovozalu.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161424aca56343---wilumok.pdfIn PDF document text
    • https://mdteam.se/ckfinder/userfiles/files/wopesutugafez.pdfIn PDF document text
    • http://clubselectionvoyages.net/images/file/vazekikikowu.pdfIn PDF document text
    • http://thienlongadv.com/upload/files/14752334268.pdfIn PDF document text
    • http://gz-chengeng.com/uploadfile/files/18604408305.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/7f3bcd28620f300b1fb8e31892e9c1a6/koduga.pdfIn PDF document text
    • http://suvagcentr.ru/userfiles/files/jakepemubesuf.pdfIn PDF document text
    • http://associatedreclaimed.com/userfiles/files/79265430649.pdfIn PDF document text
    • http://salocchi.it/userfiles/files/59391635154.pdfIn PDF document text
    • http://le383.com/uploads/files/45196250281.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/26633926002.pdfIn PDF document text
    • https://cr2tek.com/userfiles/Proj_Name/files/jijowu.pdfIn PDF document text
    • https://jerseyshorepirates.com/userfiles/files/wugunuxunibu.pdfIn PDF document text
    • http://playoz.com/ckfinder/userfiles/files/120732547.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142463c241a8---revelijakele.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/3979416281010b0ad130471982625f30/bexorixenadegez.pdfIn PDF document text
    • http://holzbau-napetschnig.at/moxitosirinogabowit.pdfIn PDF document text
    • https://xn--fct8ml6mwue.tw/uploads/files/fofebadimipuzapuja.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/161309d038780c---16248193257.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_off0000b4a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4A0 16868 bytes
SHA-256: 32856114d3f69d95a7a01bd75e265547650f6453da928e9eeb4fabba5459003c
font_01_sfnt_off0000df63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f77a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF77A 10664 bytes
SHA-256: e9d2f2dc21813433c70d50b3f3cb2711c123281fb3ffb8ef1c26015e960a3b10

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