Malicious PDF — malware analysis report

Static analysis result for SHA-256 60f5b838be5270ff…

MALICIOUS

PDF

82.8 KB Created: 2021-09-04 11:02:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 38175dd2ea917e25be597125c9914a91 SHA-1: 3437e6d2d336bb8d9933c53db2716f9ef5b30e1b SHA-256: 60f5b838be5270ffb65e547e2ac2b0a2100aa5b65c7e52ce135bd12ac2aee039
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous embedded URLs that point to compromised CMS uploads and disposable hosting sites. These links are likely intended to lure users to malicious content or further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://pantanalmsnews.com.br/ckfinder/userfiles/files/bufigisudozi.pdf In PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607da04520f94---bosipavivumoxunanufo.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab273b69456---44424518497.pdfIn PDF document text
    • https://hanakspotrebice.cz/eshop/ckfinder/userfiles/files/58939621960.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1611ac5f498adf---belufifulixasipusuwub.pdfIn PDF document text
    • https://stalbeckers.nl/userfiles/image/file/fozomenejizegalalunosike.pdfIn PDF document text
    • https://www.loscam.com/lib_common/ckeditor/ckfinder/userfiles/files/fewotemuvamatid.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/sufuzokoto.pdfIn PDF document text
    • https://easresidence.ro/app/webroot/files/userfiles/files/tibebomudim.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075bcd4405e2---dovexewerenekoxi.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ea1eabdc3---titilep.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/8934531282.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/1dfa5461e2485063187978031be01c3f/91857018011.pdfIn PDF document text
    • http://sjhrz.com/images/upload/File/70981167648.pdfIn PDF document text
    • https://xn----7sbbg1ddpkdc.xn--j1amh/uploads/files/karekeropawe.pdfIn PDF document text
    • https://salubrismd.com/wp-content/plugins/super-forms/uploads/php/files/c527e20fa36bb1ebd2e0671d3b83d524/63282969464.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/3cd4d4e59caf3c52e0083b103b4a4c69/mesowe.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/nawedegivo.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c109eb06ae7---11513109074.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c964377e86d---xatal.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/bec7375a3ecb8c2b7e107a79a385085f/sowadezesiwodipamudoje.pdfIn PDF document text
    • http://sangtaoad.com/uploads/userfiles/file/9603503740.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/nkgllb25v6b8emsbqmpqv17nd5/73934220581.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=there+will+never+be+another+you+trumpet+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_off0000d548.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD548 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED5F 11064 bytes
SHA-256: 24447c617275cf4429c936324bd24c7b5a0197a6b05cf3881e3702c16fc02aad
font_02_sfnt_off000106c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C5 20872 bytes
SHA-256: 5f0db6de16d3506c52f900d8e3e309ae14e86629e3543fa0e6393916f4ba72fd

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