Malicious PDF — malware analysis report

Static analysis result for SHA-256 d54813ac95396ac0…

MALICIOUS

PDF

81.2 KB Created: 2021-09-07 05:30:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7824573561b0ea5d670eb384542d2ef2 SHA-1: 40711769e6771c045b802c8a741487672b19f010 SHA-256: d54813ac95396ac0a1ca1675b14720bd4c9392f50c6be1e2566ddfb0d52f5655
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or are part of a link farm hosted on disposable domains. The ML classifier strongly indicated maliciousness. The primary attack pattern observed is the use of a link farm to direct users to external, potentially malicious, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • 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://infrive.ru/uplcv?utm_term=peavey+classic+series+50%2F50+manual PDF link annotation
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613184c07cf8c---14486731123.pdfIn PDF document text
    • http://apvn.info/userfiles/file/46745855874.pdfIn PDF document text
    • https://netiko.fr/img/Data/file/10479474307.pdfIn PDF document text
    • http://bioscipublisher.com/files/upfiles/file/vizefepazu.pdfIn PDF document text
    • http://bephoangdung.vn/uploads/ckfinder/files/81824165570.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/lejep.pdfIn PDF document text
    • https://zoldlaptop.hu/ckfinder/userfiles/files/jolalur.pdfIn PDF document text
    • http://njchemland.com/upload/files/falivajeguludokuw.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609609b9cf9d2---79880569943.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/72683157242.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/20b41f2713eadb9913f19989a2898bb9/porirutotolamabagatak.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/molefizalobidujixudomez.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc0be440df1---nemiluwazoxukamop.pdfIn PDF document text
    • http://xn----0tbbbfo0f.xn--p1ai/userfiles/file/nuzunam.pdfIn PDF document text
    • http://korean-school.hu/hangul/userfiles/file/jusavepif.pdfIn PDF document text
    • https://tvsporedi.si/vsebina/81153581902.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/48605810993.pdfIn PDF document text
    • https://85097781.com/upload/files/wozeweg.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071986ab95a1---vasodidibifopitul.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085e65ee31d3---nazarufasavikiromaduvigax.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8016d3b78---bowonuvigolijifevuzejobig.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c579645f5e0---namegivusikezenasog.pdfIn PDF document text
    • https://whiteelephant.co.in/wp-content/plugins/super-forms/uploads/php/files/d7d9fc7b6be4b4c7039c4f1d9cab553d/53668992614.pdfIn PDF document text
    • http://miraesusan.com/ckupload/files/51191572463.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/bbbcf2a801be901b5229f7f21bd19555/9873167060.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_off0000d64e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD64E 18320 bytes
SHA-256: ba33b2accc9e8aa71e5e2b83f6a5cde4e147dc645d427087581e692e18899893
font_01_sfnt_off000105ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E03 10744 bytes
SHA-256: da01717859f1d7b1ac66eb5825cdf03e85172daf02fe1fe15b58d7b2a680049b

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