Malicious PDF — malware analysis report

Static analysis result for SHA-256 e52825b9cf2b15e1…

MALICIOUS

PDF

78.9 KB Created: 2021-09-21 12:53:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4508b64c7382f3f0f7739c933115acda SHA-1: 2d479e7c01b4db92c44749ae0e74228274d2fb97 SHA-256: e52825b9cf2b15e1a0d8a5759123e5b4ed1194b547f0bdfc1d171f95e9b634d3
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, indicating a high likelihood of malicious intent. The heuristics reveal that the PDF contains a link farm pointing to compromised WordPress upload storage, suggesting it is used to host or redirect to malicious content. The presence of numerous unknown URLs further supports this, likely serving as lures for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614368ce76b31---tebexawijuwovegudutiji.pdf In PDF document text
    • http://macierz-grodziec.org/files/file/51800001429.pdfIn PDF document text
    • http://ifa-astrologie.de/userfiles/file/tegefiz.pdfIn PDF document text
    • http://bakineshr.az/ckfinder/userfiles/files/15023618311.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/ba95055425ea8a37bb9f6baaa89e559a/74750436274.pdfIn PDF document text
    • http://kleinschaden.expert/userfiles/file/monotedinisoded.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/ih4gmhnk8ja9a0vs0o6c0643n9/ropovelutifulaxufu.pdfIn PDF document text
    • http://xn--80aer5aza.xn--c1acndkmcarx.xn--p1ai/ckfinder/userfiles/files/givit.pdfIn PDF document text
    • https://hchoanglong.vn/userfiles/file/3068235709.pdfIn PDF document text
    • http://makinsushi.com/uploads/files/58255609758.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/ss9f5vebop76ilk9qvt0ap0h7j/minuzos.pdfIn PDF document text
    • https://kamwalibais.com/userfiles/file/4102573446.pdfIn PDF document text
    • https://majubesar.net/contents/files/15733867798.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/sosewar.pdfIn PDF document text
    • http://polletnv.be/uploads/files/vavikijiririsorafedetime.pdfIn PDF document text
    • http://joyear.com/ckfinder/userfiles/files/52645060294.pdfIn PDF document text
    • http://universalgroupautos.com/files/others/gamaximetemumox.pdfIn PDF document text
    • https://nasikampung.info/contents/files/pufamemijigukag.pdfIn PDF document text
    • http://tdbm.vn/upload/files/87997120879.pdfIn PDF document text
    • http://myucpb.com/userfiles/file/gujuno.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/cff1ee4c336f1c9e315a0ffd0847cebd/15883758081.pdfIn PDF document text
    • https://francoisdaulte.com/ckfinder/userfiles/files/28960037591.pdfIn PDF document text
    • http://projecthouse.bg/uploads/CKfinder/files/169976671.pdfIn PDF document text
    • http://xinghui.co/upload/ckimg/files/202109111620256622.pdfIn PDF document text
    • http://ingmarcofaedi.com/userfiles/files/95229594749.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=tamil+to+english+translator+appPDF 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_off0000d225.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD225 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA37 16880 bytes
SHA-256: 3648c276903273ed76414b9bd1d419ce064f0de22687607074986d240048c5c2
font_02_sfnt_off000115f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115F0 10664 bytes
SHA-256: 004ffaae0307fff8441961f98e9f66ec2cde9f260d7c401b23886312d4c2aa1e

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