Malicious PDF — malware analysis report

Static analysis result for SHA-256 1954a661b411c820…

MALICIOUS

PDF

81.4 KB Created: 2021-09-22 10:35:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 08aa424917fad8fe709b0e79bdbbfd38 SHA-1: 954507aca92a909d81d23ed93899f67857b34250 SHA-256: 1954a661b411c820c6a4aea0b9d8dc5ab20030ef288d51ece4d3fd0675964b7e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous embedded URLs pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution campaign. The document's structure as a link farm, combined with the use of UTM parameters, indicates an attempt to direct users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://infrive.ru/uplcv?utm_term=doulci+activator+tool PDF link annotation
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16133b1826a09d---bijorefepuxazexosaba.pdfIn PDF document text
    • http://vuonlan.vn/data/upload/files/16084331473.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/3ccd58acf25361d641ffff5f5179eeda/7588431104.pdfIn PDF document text
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bebaruwebokugonovenelo.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/12163012648.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/161486cb182659---powurode.pdfIn PDF document text
    • http://www.sudaff.com/pics/file/kenosuwaresexejowakanevew.pdfIn PDF document text
    • http://app0.linkeo.it/ckfinder/userfiles/files/50983114124.pdfIn PDF document text
    • https://postelezmasivu-olomouc.cz/ckfinder/userfiles/files/10618139826.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/161380152e586d---54221598994.pdfIn PDF document text
    • https://buddhaart.in/userfiles/file/15014872578.pdfIn PDF document text
    • http://touristclub.in/userfiles/file/bepixamiker.pdfIn PDF document text
    • http://thicongdiennuocmiennam.com/uploads/files/mimifamativ.pdfIn PDF document text
    • http://1careglobal.com/upload/files/20935880635.pdfIn PDF document text
    • http://saharun.org/uploads/ckfinder/userfiles/files/dujovojiduzuzozofas.pdfIn PDF document text
    • http://snsi.jp/image/news_file/97386443286.pdfIn PDF document text
    • http://xn----7sbbgprpk7biiq.xn--p1ai/admin/ckfinder/userfiles/files/72937980310.pdfIn PDF document text
    • http://medtravel.pro/images/hand_uploaded/files/82083095650.pdfIn PDF document text
    • https://vpmemorial.net/images/file/94739195499.pdfIn PDF document text
    • http://france-ex.com/images/blog/file/83044363605.pdfIn PDF document text
    • http://szguilong.com/userfiles/files/85657383198.pdfIn PDF document text
    • http://cnpair.com/userfiles/file/51396906448.pdfIn PDF document text
    • https://www.nbc.com.vn/ckfinder/userfiles/files/xutos.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16139aa294f5af---wavivawiwipudem.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_off0000db58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB58 17960 bytes
SHA-256: 61e6c9a0a70a0c1786425675cfcbaaf03ccb16e74e0585d8bdc11541e223351c
font_01_sfnt_off0001097d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1097D 9988 bytes
SHA-256: d53fc384a37f5ce5c05b1b9a0f9dab441f27c808386fc46e5a5312942b40526f
font_02_sfnt_off00011fc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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