Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4b841f7aee27941…

MALICIOUS

PDF

79.1 KB Created: 2021-09-08 08:44:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 24a16058cbb6aca833f480b56d1a14c5 SHA-1: 57f9fdbbc4ec48d5b24cfb788e239dd9bfb67a83 SHA-256: d4b841f7aee2794134ff62fd4c4f9b80f24a95737ba270b6bb18b650c440aa34
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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 http://www.emailposte.com/pictures/fosof.pdf In PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1611d0b906ee65---zuranapimujujezif.pdfIn PDF document text
    • http://ud2-140.com/files/guvimober.pdfIn PDF document text
    • https://www.bankkartya.hu/js/ckfinder/userfiles/files/bozarababijufijog.pdfIn PDF document text
    • http://kengosushionlineorder.com/uploads/files/xuwetokawowagifeje.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/23418624355.pdfIn PDF document text
    • http://shijijiaming.net/filespath/files/20210908122534.pdfIn PDF document text
    • http://savaksangida.com/resimler/files/24551147464.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c304d93c8a0---didimemonumobaxavuru.pdfIn PDF document text
    • http://www.smartusb.info/images/library/File/17713886935.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/xukogijitenanokilaboneb.pdfIn PDF document text
    • https://hanomanberjaya.com/contents//files/55655103531.pdfIn PDF document text
    • http://dryoucosmeceutical.com/userfiles/files/53045865339.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087979c01332---91750411695.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/5127b3a8fe10a74d3dfca81a180c357d/2580415940.pdfIn PDF document text
    • http://liveisagenix.com/ckfinder/userfiles/files/nijanafugipojig.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/c05235cf094dcbdd08f471faf7a6a28f/rikajiziwotidag.pdfIn PDF document text
    • http://xn--rssx31a7tec6p.com/upload/userfiles/files/20210727230738.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16086bbb9ed009---7961433490.pdfIn PDF document text
    • http://sbsinternationalschool.org/sbsisnew/userfiles/file/48074405524.pdfIn PDF document text
    • https://ashleymongolia.mn/uploads/files/91889692336.pdfIn PDF document text
    • http://soles2walk.cz/data/file/83548543427.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1610c68748f548---99738892432.pdfIn PDF document text
    • http://quincy.pl/ckfinder/userfiles/files/zukejed.pdfIn PDF document text
    • http://giayviettri.com/img-ftec/files/64958396533.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613265441d479---sazixuzixadiwapupugow.pdfIn PDF document text
    • http://bronia.org/userfiles/file/23466790180.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=introduction+to+political+sociology+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_off0000cf68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e77f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE77F 10828 bytes
SHA-256: 393202076200f80ebe6eb51507b0507f0298bbd9a34c75312d0bd2159f6088ea
font_02_sfnt_off00010068.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10068 17732 bytes
SHA-256: 7fbdb14aa791cde6bf59da7bd6be705cce3d2eeadcf64531590af3e6583d1480

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