Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e92c16f0046373e…

MALICIOUS

PDF

76.3 KB Created: 2021-09-15 15:02:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bad5ded75306cd71b8d0fb7a87893b30 SHA-1: 44afb9b4456eb0162eb55c060be2a294d312f75b SHA-256: 7e92c16f0046373ee52d037e09663a5ee8aa2d616f8da74e266ac47ff31112e4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • 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.
  • 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://crewmak.ru/uplcv?utm_term=game+killer+mod+apk PDF link annotation
    • http://nbmounts.com/userfiles/file/1631532741.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210914165408825964137.pdfIn PDF document text
    • http://dharmapuridiocese.com/svnprojects/DHD/Source/images/files/39189902113.pdfIn PDF document text
    • http://paliukenas.lt/i/File/64612141809.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/f7fc8e54c496e64951a92b2328b705e6/21569658511.pdfIn PDF document text
    • http://eyela.kr/uploadfile/fckeditor/file/varedisabaseripeluvug.pdfIn PDF document text
    • http://josephfellerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lanudur.pdfIn PDF document text
    • http://utpcomp.ru/uploads/files/fukizop.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/7me4q4hdsavhbvtcmepgh89rqa/bevipajewozatajozeki.pdfIn PDF document text
    • http://rrbrentacars.com/files/others/vojapemejilupe.pdfIn PDF document text
    • http://instant-image.net/UserFiles/Site/File/77418278407.pdfIn PDF document text
    • http://studiomanzella.com/userfiles/files/lopuvi.pdfIn PDF document text
    • https://principesgs.com/userfiles/file/58104387693.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/90269857004.pdfIn PDF document text
    • https://www.natursany.com/ckfinder/userfiles/files/buzibe.pdfIn PDF document text
    • http://jtravel.clickis.kr/FileData/ckfinder/files/20210902_DBDB9C2A4D6B7CAC.pdfIn PDF document text
    • http://www.tempshift.com/app/webroot/files/uploadimagesfile/dakujovime.pdfIn PDF document text
    • http://asude.istanbul/ck_images/files/punefofedi.pdfIn PDF document text
    • http://195exim.com/datas/files/14339236560.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/40e8e0b5785917a0986ac48b1ab1c023/58256888230.pdfIn PDF document text
    • http://pnlestari.com/visitbali/image/files/kekobuwifo.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab3fe17519---bijoxorubur.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/161346b9dd6145---17857862357.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_off0000c6cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6CD 17756 bytes
SHA-256: b7ac57188823d541fd4dd52e657ee6dc1b7e5377b7e569d9136476f60247764a
font_01_sfnt_off0000f4ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ce5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE5 10312 bytes
SHA-256: 62fd953fabfa49b1b2d5d2820874af19f3f7ec4310bedfea80d288cd66e39246

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