Malicious PDF — malware analysis report

Static analysis result for SHA-256 686e68c2fe1964c9…

MALICIOUS

PDF

87.7 KB Created: 2021-08-01 18:57:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 9b136e1f48500373410de54074740ac2 SHA-1: e917188a0bb636ac4af808749d2f20ffeb729814 SHA-256: 686e68c2fe1964c925ae7020f1985f69879b691ea657d843903c0ca9b7eb9ba6
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream, which is a common technique for executing malicious code. Additionally, numerous external URLs were extracted, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites or download further payloads. The ML classifier strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://irlanc.ru/uplcv?utm_term=how+to+use+a+smeg+coffee+machine PDF link annotation
    • http://edgecs.net/documents/sifunemakedujefeguxozoxi.pdfIn PDF document text
    • http://quadocdao.vn/uploads/files/30861107804.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160e60d02986ae---kajupavavapalalum.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/fa5b4d8c48088f16fd9c2ca3d860f111/totapisenoj.pdfIn PDF document text
    • http://xinyaoqiye.com/upload_fck/file/2021-6-11/20210611225113699753.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160b05c049d474---10848975937.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da57a7bfb68---tinam.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e126a420167---36326739993.pdfIn PDF document text
    • http://bigband-ulm.de/userfiles/files/37887720350.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160ad1ba949cdb---89495321876.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae7d452332---fepibuz.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/lbbh0mmgsfe3v6duid4spi6ot3/33612635245.pdfIn PDF document text
    • https://mimpishio2bet.com/contents//files/7860823148.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/jqt315lm8263h8f2apcbirnp9u/ginuguwofade.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/18416179947.pdfIn PDF document text
    • https://etonbio.com/newsLetters/images/file/29778997524.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077136863ea6---wipojolorumulujisedefede.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/dd8fd4d0bbabce0ad4eadd328738f7fb/2946510179.pdfIn PDF document text
    • http://heaig.org/editor/ckfinder/userfiles/files/69937490513.pdfIn PDF document text
    • http://royalwedding.jp/images/blog//file/53591365546.pdfIn PDF document text
    • http://carnow.jp/js/upload/files/dubodaredep.pdfIn PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/27474023195.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/d118d5afa6b8f1b6acba9756a33f74f6/fabupokapoparogezoluso.pdfIn PDF document text
    • http://paoladebenedetti.eu/userfiles/files/zamamepemeruzodi.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/7b81934fc696afd62a1b7eb486fc45a7/pafejekos.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///91933126758.pdfIn PDF document text
    • 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_off0000f2c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C2 16584 bytes
SHA-256: 849c53f696ad70a7ff9c6b0c2c35710f1dc03ea9278a9c1d4c641c9fd35e8821
font_01_sfnt_off00011dc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000135dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135DD 10812 bytes
SHA-256: 61bd1a775d212b08da4e00dfcc2281d55dc52937f7325719fd55d2f63fcf4f05

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