Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fb5ce7244e82fd7…

MALICIOUS

PDF

77.4 KB Created: 2021-08-26 14:02:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 87c9559e4250e879de3263e4f24172e9 SHA-1: caad4e2fc9338085958b066219d8d959fe35e75a SHA-256: 4fb5ce7244e82fd7f080c22af9df11706142b75a4439fba9b72f87fdf9116cac
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to compromised WordPress upload directories and other disposable hosting sites, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to phishing sites or download further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/0pfm6vb13i6q5o5ckmvne9s916/32958528074.pdf In PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ac5d7c6612f---40893642438.pdfIn PDF document text
    • https://tahubunting1.com/contents//files/17877650234.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/zenipovivawunizirugaxog.pdfIn PDF document text
    • http://cerritos.songhakbbq.com/uploads/files/mefupijejobujudenelopa.pdfIn PDF document text
    • https://gruppopolidori.com/upload/image/file/2941874300.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/1ji3lheiq50jtunobm1lmapooj/84654470310.pdfIn PDF document text
    • http://nwatchonline.net/userfiles/file/gavorugugibobewuga.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1611089ad50db3---jilixazabi.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/16074746d1979a---20311484032.pdfIn PDF document text
    • http://toyotarent.tw/FileData/ckfinder/files/20210728_784ADEB4534D17D7.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/48o9n8le7cu2r9reiip9o3oi54/ruxuxipudegimibub.pdfIn PDF document text
    • https://fokusmedia.com/images/uploads/vewizukomuretafonumerew.pdfIn PDF document text
    • http://1utilaje.ro/mm/file/31090844541.pdfIn PDF document text
    • http://smartraoptics.com/fck_filemanager_upload/file/kokuwajezatikafafap.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/905b9dfbf302aee387d6ffa255e691a2/9666736229.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160f14e2000a4e---77802789923.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/fifipafuwukekozuguloz.pdfIn PDF document text
    • https://sayurhijau.com/contents//files/pofij.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8fd054eef---wakor.pdfIn PDF document text
    • http://dr-onesrl.com/userfiles/files/domiw.pdfIn PDF document text
    • http://debseven.net/UserFiles/File/93395837508.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=annals+of+clinical+pharmacology+%26+toxicology+impact+factorPDF 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_off0000cbfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBFD 16308 bytes
SHA-256: eb30591a12a69411ae7d664c102d940cf9e0f14f57644a2f3ee0d3db3dbe739d
font_01_sfnt_off0000f636.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF636 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E4D 10792 bytes
SHA-256: 618d5fb01188abe9b23716f26333dd3ae4c7186b0bd460504abcbbb9e71eb269

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