Malicious PDF — malware analysis report

Static analysis result for SHA-256 7202cefdca2b9f4c…

MALICIOUS

PDF

80.7 KB Created: 2021-08-19 21:27:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f100686979436e62311a378ef938f591 SHA-1: eee0423b0d2dcf9c0a8b0b3a3bedca48a7ee7ccc SHA-256: 7202cefdca2b9f4c914da27ea13f8976a4f130e1ea73ac93ab77a79f7bc621d7
156 Risk Score

Malware Insights

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

The file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. Multiple URLs point to compromised CMS upload directories and disposable hosting, suggesting an attempt to lure users to malicious sites. The PDF structure and embedded URLs indicate a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://yucekalipmakina.com/tsrm1/img/userfiles/file/wewikajozamaki.pdf In PDF document text
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/ff1f7c3d45db3edc71022b6441bff0b7/93159088337.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/2cd45733bb304968a5f9082295c1924f/sivad.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160f0fbd577bb8---56103172691.pdfIn PDF document text
    • http://lltsg.com/uploadfile/file///2021062603433228.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/perufobitunopowike.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d0d462421a---44123873382.pdfIn PDF document text
    • https://journeywithmypet.com/ckfinder/userfiles/files/fatejokugewetorefefa.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/64podl4c75tat9cimip6vdjcj5/nevesagiburerenowixawumo.pdfIn PDF document text
    • http://hiddenroots.org/clients/19739/File/44428913314.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d36ea41135---dipub.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/332f1b674c043876d113bac2a96a9762/gibosovezawu.pdfIn PDF document text
    • https://nvsrolko.org/ckfinder/userfiles/files/rufiziviwibonugep.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/16318482529.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/lixepugevakesiniv.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/xazumupumusojojokoxi.pdfIn PDF document text
    • http://ipea.kr/userData/board/file/2698276888.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/zufexokijatimi.pdfIn PDF document text
    • http://nakamurasangyou.jp/app/webroot/uploads/files/28572487203.pdfIn PDF document text
    • https://bimstudioinc.com/media/files/81381529490.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/40594a4b5351c383be68d1f96b88ae88/zosulut.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/9f86878df9ecc3dedc9bc073fcfb1d29/lojuragikapetebifuzira.pdfIn PDF document text
    • http://erictex.com/ufiles/files/3142640706.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/3cf5a66207720d5d66c3563186a35fc1/zupipofor.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/nogejif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=snellen+eye+chart+pdf+downloadPDF 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_off0000d6a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A7 10732 bytes
SHA-256: 8afb70c1788ae9a16c5ba8cad32868f673f8406eccf731b27af0a73770a4baf0
font_01_sfnt_off0000ef62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010774.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10774 18004 bytes
SHA-256: beec63d63db1a0fad928c454b5c19f97aa5931fc952425c83f509e379aee07e0

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