Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c807c3ac33032ee…

MALICIOUS

PDF

81.8 KB Created: 2021-09-14 06:24:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9b675dd21bfa677ea846502a2b0031d2 SHA-1: c48379ec866cc724cd580154d11ffa8185bdff3f SHA-256: 7c807c3ac33032eec9ee25d23c62ce0db9642cb40b953a8e1e76f231058eb5f1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a phishing or link-farming scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a malicious PDF designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://synerhu.ru/uplcv?utm_term=last+day+on+earth+survival+hack+ios+2020 PDF link annotation
    • https://idosekotthonaveresegyhaz.hu/files/files/70813564665.pdfIn PDF document text
    • http://hodinovysoused.cz/upload/file/jopefejenokopo.pdfIn PDF document text
    • https://dwitunggaljaya.com/sitefiles/file/pavenu.pdfIn PDF document text
    • http://topup-fight.com/ckfinder/userfiles/files/30657008799.pdfIn PDF document text
    • https://rajakeempat.com/contents/files/fagisetaxubaloxofe.pdfIn PDF document text
    • https://jss-moms.si/upload/File/33584932816.pdfIn PDF document text
    • http://pngroup.pl/ckfinder/userfiles/files/sogodenonajukediguwoxil.pdfIn PDF document text
    • http://humanlitech.com/files/files/wovilazulolovimugetom.pdfIn PDF document text
    • https://cihangirhotel.com/upload/ckfinder/files/newimavotuxezar.pdfIn PDF document text
    • http://hadt.vn/upload/files/14190453158.pdfIn PDF document text
    • https://optical-axis.com/uploads/files/202109130454386663.pdfIn PDF document text
    • http://athaj2.specialty-match.com/upload/files/67920448790.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/92171493037.pdfIn PDF document text
    • https://euroialinsol.ro/userfiles/file/gefaseja.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613544f11bd2b---jukibiwofovijizagogonunix.pdfIn PDF document text
    • https://ntct-dz.com/ckfinder/userfiles/files/nawifanoxujuxexogi.pdfIn PDF document text
    • http://giaydantuongphongngudep.com/images/news/file/turajalisa.pdfIn PDF document text
    • http://186086.com/upload/files/96959971192.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613e33038a3a0---zasamesulesi.pdfIn PDF document text
    • https://czus-lukasa.sk/userfiles/file/jasajumelezipeduxaje.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f27d4e2270---23051339215.pdfIn PDF document text
    • https://adikketiga.com/contents/files/wesetefunobave.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c400.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC400 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC0D 1820 bytes
SHA-256: ef4c56b83544acc0eae329b123dcb13384a4443b8ee25b6b011fcec9f25c534c
font_02_sfnt_off0000e498.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE498 11036 bytes
SHA-256: a3eb31033fc5458007774abc451201a49006d8a8f8ef023efac355c675da56cd
font_03_sfnt_off0000fe47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE47 22416 bytes
SHA-256: 6b988c361d84a94daaf4465610d6158ba0792d3e1606a289ecd01fb9eb729f05

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