Malicious PDF — malware analysis report

Static analysis result for SHA-256 7eafb44323944174…

MALICIOUS

PDF

92.7 KB Created: 2021-07-15 11:19:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 717e4fed7c77d493e622472c983709f8 SHA-1: 5b813bec44cd67b77e644d3c3ece8988bf7c5e9f SHA-256: 7eafb44323944174fcf1c4f4964d2addfba1a0182c9d4c4bf7bf91f1c99c90b7
136 Risk Score

Malware Insights

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

The PDF contains numerous embedded links pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The ML classifier strongly indicates maliciousness, and the link farm behavior suggests the PDF is designed to redirect users to potentially harmful content or phishing sites. The presence of multiple compromised CMS upload links and disposable hosting domains reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

Heuristics 6

  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://philabc.ru/uplcv?utm_term=the+love+of+my+life
    • https://majubesar.net/contents//files/wolenalu.pdf
    • http://newbusan.net/FileData/ckfinder/files/20210626_03E82017107C62AD.pdf
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/5dfe1f2135784bd88c7c2106daf7ee69/47783305235.pdf
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607e6bfc1fea4---8946979589.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16095d84b57ece---kegodilupegokibife.pdf
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/hve0haq8ecjknic65chko96j97/fifisabazusawodan.pdf
    • https://al-farh-iq.com/upload/userfiles/file/vodulumewibesegimoxilabur.pdf
    • http://saxonsaxtonfamilyreunion.com/clients/f/f6/f6d0431f970e0833b0867c311dafb132/File/69943368274.pdf
    • https://t2sc.me/userfiles/70518670166.pdf
    • http://meble-tk.pl/userfiles/file/7793134072.pdf
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/fb45a57bd8975e723638074584282001/26199038852.pdf
    • https://gachbinhduong.com/upload/file/gupojaketatalabolujavo.pdf
    • https://amursvoidom.ru/media/files/nakokenunobavimapesa.pdf
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/tf406te2aoitjj9vd60mag5fe5/24170094168.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/flpfidgo1560hitnt81d9ne8f0/34743530122.pdf
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/4vmc4diepkp930dcr7mupl02m1/12894553087.pdf
    • https://autosaloncenter.com/uploads/file/vejimawixofezasadal.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e35a06ea4c---74889515480.pdf
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0cebd7380---73067340317.pdf
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0eabb9e30a---23477210448.pdf
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16092176d1b22f---18294931242.pdf
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160798930df26c---ruvezavab.pdf
    • http://starwindows.ie/ckfinder/userfiles/files/40715433904.pdf
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/6437b83822e6e735676230794d2fd22a/kusuborilivusafepipovix.pdf
    • http://shepardfarm.com/clients/877021/File/18104470282.pdf
    • 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_off00010903.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10903 16792 bytes
font_01_sfnt_off00012119.bin
c5ad1ed7ff88deecc5851b436f5da5d14cf5ac5e60573609678ec488a8c2882a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12119 9992 bytes
font_02_sfnt_off0001373b.bin
81b3d0719d1bd8a5624c71547f298a80311ed596a33659a464e53791921fe29b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1373B 17716 bytes

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