Malicious PDF — malware analysis report

Static analysis result for SHA-256 16acfc04cd91b87e…

MALICIOUS

PDF

73.4 KB Created: 2021-09-16 04:46:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ca90e4f01d26452fa67a7de9d9ccf16a SHA-1: a8134ac5f3716dd4c4759130dfaba598e707bf5c SHA-256: 16acfc04cd91b87e143bad5df000fa852b58a27a7d5afc75f5c75e3f7a6f6238
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous external links, many pointing to compromised WordPress upload directories, suggesting a phishing or malware distribution lure. The presence of embedded URLs and the overall structure indicate an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://allytemp.ru/uplcv?utm_term=mi+box+supported+apps PDF link annotation
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/161354e6767624---kififa.pdfIn PDF document text
    • http://seoulmenu.com/uploads/files/ranixowupum.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/81863105620.pdfIn PDF document text
    • http://barbusci.it/maisUserFile/file/vonojotuxukibem.pdfIn PDF document text
    • http://studiotecnicobonoli.com/userfiles/files/17866614555.pdfIn PDF document text
    • http://asremajazi.com/uploads/files/96327799002.pdfIn PDF document text
    • http://brickform.cz/obrazky/files/mepimipixa.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/39727d0c9db226b4492b1bcc09a977bc/33955602808.pdfIn PDF document text
    • http://lonerangerfanclub.com/ckfinder/userfiles/files/77972212744.pdfIn PDF document text
    • https://partnyor.az/userfiles/file/2831001759.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/futitinowe.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/b0b126ed83a5c3555c7730e87fb4b752/defir.pdfIn PDF document text
    • http://itcck.org/upload/editor/file/kibagulufujidibeta.pdfIn PDF document text
    • http://zavalinka.by/var/upload/file/41545143261.pdfIn PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/lukese.pdfIn PDF document text
    • http://erbaytag.com/resimler/files/tadazarewolizexo.pdfIn PDF document text
    • https://jager-ig.tw/up_photo/file/kobidalowerir.pdfIn PDF document text
    • http://chieucoingason.vn/files/retixirusigajamuramovuzot.pdfIn PDF document text
    • http://chi-kara.net/Upload/files/47565390678.pdfIn PDF document text
    • https://acp-luxusingatlanok.hu/ckfinder/userfiles/files/zininizer.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16130253222c06---gumamafazixuzeg.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/50179432373.pdfIn PDF document text
    • https://nbc.com.vn/ckfinder/userfiles/files/80963694180.pdfIn PDF document text
    • https://stmpallet.com/ckfinder/userfiles/files/55118939166.pdfIn PDF document text
    • https://cahayamimpi1.com/contents/files/57366118106.pdfIn PDF document text
    • https://nationalshield-uae.com/userfiles/files/48722049267.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_off0000be25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE25 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d637.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD637 16276 bytes
SHA-256: f8058982f5d26dd69db136b1155c3f09772f7d338e07a5d98313ec66c38a9b35
font_02_sfnt_off00010056.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10056 10568 bytes
SHA-256: 95c429b21cb56c000ac619f83218d9785117bd25095ab663a9d5c44e97fa93c6

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