Malicious PDF — malware analysis report

Static analysis result for SHA-256 547377c2a5eae21e…

MALICIOUS

PDF

80.9 KB Created: 2021-09-08 00:48:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: c97702eeb3ba11bb211f48dd090e5ccf SHA-1: 04cbf8eacffe47c2006255029d2b675ea9cad21e SHA-256: 547377c2a5eae21efb5172b71e84bf61405036c2005eb8b5845daed2fd2a15ae
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. ClamAV and ML classifiers flagged this PDF as malicious, specifically identifying it as a phishing or trojan variant. The presence of compromised CMS upload links suggests an attempt to host malicious content or facilitate further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://slp72.com/clients/7/7b/7b902bee17765b19ebdde6030f24742d/File/samaniz.pdf In PDF document text
    • http://paramountswimwear.com/userfiles/files/togelozelufukuvoxowubusan.pdfIn PDF document text
    • http://shangrilayunnan.com/ckfinder/userfiles/files/74115159767.pdfIn PDF document text
    • https://xn--80aaijz0c.xn--p1ai/ckfinder/userfiles/files/fotoxibisulivetobuvu.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/29degdcqc0h0a0nqdqta24sl5h/23453600208.pdfIn PDF document text
    • http://dharmapremipariwar.org/userfiles/file/81416849373.pdfIn PDF document text
    • http://aodaibooking.com/FileData/ckfinder/files/20210820_BF5F56F20BAB0B13.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/6901312608afbcc08cf8a929830ae384/xixiwirakikavuvolota.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/100c828aa5732b570d35fc0a666c1e6d/92140613106.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/00365cb0ba444c4227f70bb2620fcf29/piradapipa.pdfIn PDF document text
    • https://ymvii.com/admin/upload/files/86516178069.pdfIn PDF document text
    • http://bamila.vn/luutru/files/25042930819.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/f2b308d5c406d06781c44d8eb8641897/mufiruwuzidawi.pdfIn PDF document text
    • http://theettiaresmontreal.com/clients/f/f0/f03dfc1790708d0b03c48e9879ef2ea6/File/kewatajidenalexos.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607bdfc210c17---lofilane.pdfIn PDF document text
    • http://vinhomeshaiphong.net/app/webroot/img/files/raxulovedekasadu.pdfIn PDF document text
    • https://rasathantrananotech.com/ckfinder/userfiles/files/xofonivuritokifunovexa.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f004e4e01e---nalesagoforatitewi.pdfIn PDF document text
    • http://come2menorca.com/images/file/25319791291.pdfIn PDF document text
    • http://acquadiqualita.it/ckfinder/userfiles/files/40228069476.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/7e97hbqvac5c56ui72d1eo74nq/tizenujogizugodafirileloj.pdfIn PDF document text
    • https://skvacations.com/userfiles/file/4579004557.pdfIn PDF document text
    • http://self119.net/upload/userfiles/2021/06/files/210620075244.pdfIn PDF document text
    • http://bhavalaya.org/ckfinder/userfiles/files/zomegi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=brassage+genetique+cours+terminale+s+pdfPDF link annotation
    • 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_off0000d128.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD128 19192 bytes
SHA-256: 1de799c58b9d0e5ef260345c3a8beb05ad396f2b6a9f0f446956a13c4708a856
font_01_sfnt_off0001017d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1017D 11264 bytes
SHA-256: b3e03e492490731f8137c26a14b9fbcefd15d43b9a44db3a9efae561fb8004dc
font_02_sfnt_off00011b6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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