Malicious PDF — malware analysis report

Static analysis result for SHA-256 845a3150d4067838…

MALICIOUS

PDF

90.8 KB Created: 2021-07-04 04:56:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: eb11fff69dba0ed6192176a9cd31bf66 SHA-1: ea4e1aa64275611e58704963deb26f785c0e193f SHA-256: 845a3150d4067838ee1af98221dce7ab806e274e6f85452f91a98cb5198200c5
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous external URLs, many hosted on domains associated with compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://aircond.md/upload_fck/file/lojomamewedovivogorup.pdf
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c0dca0709ba---92566673611.pdf
    • http://angelojrobles.com/admin_initial_test/userfiles/file/wovotamotutowuvugaw.pdf
    • http://aeronautike.com/userfiles/file/34711491089.pdf
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/0jg3sad9sic3jiijafsk264h5j/wawusuzumunavumiranaka.pdf
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c5de044c051c356fbaba4fb103bd59e1/49294275389.pdf
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a898abc5e6c---runibowogabivuroweguve.pdf
    • https://mertlakustika.cz/images/pages/file/sanareru.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/33dddskh8q0ngdq29s670gojpi/17121606700.pdf
    • http://kartplast.com/resimler/files/95795513415.pdf
    • http://copy2d.com/ftp/image/file/javepolopesolenaxujo.pdf
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/1bae67b2e6b091964e57fbf6d4e7d441/19854313200.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608124e4a1aab---14910354813.pdf
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/2pgjhcrfomm93kdvugc17ihb85/52675124078.pdf
    • http://www.dereformasenalicante.com/archivos/files/79080993166.pdf
    • http://scard.vn/app/webroot/uploads/files/79480963892.pdf
    • http://kagoshimakojintaxi.com/userfiles/file/tupixaropewesixup.pdf
    • http://cesishotel.com/res/wysiwyg/file/fizufewidibusubotizusifi.pdf
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/16083c445f2ab7---wezaxejibizolu.pdf
    • http://resetimpianti.it/reset/public/file/83334140979.pdf
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608695212faa6---95765331231.pdf
    • http://babywagen24.de/userfiles/file/6755357895.pdf
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1607b37cd84f0b---43551673874.pdf
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7c79575fc---fixovuguwegu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+work+out+spring+constant
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe2e.bin
0dd07223f77506c445ffc86de8ecd6a1ff501822677944c32edeec8f5fd3ab69
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE2E 17744 bytes
font_01_sfnt_off00012d52.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D52 16792 bytes
font_02_sfnt_off00014569.bin
708cca4bdb455b3f8a87fb4bb3e36be39bdef1823f3ec5f346c58b25e9359723
pdf-font-stream PDF embedded font (sfnt) at offset 0x14569 10640 bytes