Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a77f0e568d140a6…

MALICIOUS

PDF

84.9 KB Created: 2021-07-01 10:31:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 55d952a406a0514f6727de6436a51e54 SHA-1: 2a10f4bf78b6016e871b645fd2aa3d6d7cb60e1d SHA-256: 6a77f0e568d140a69254524276dbdad1a0ff1a13e6fbfe4f6b74773ca24fe02f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external URLs hosted on potentially compromised WordPress sites or disposable domains. The presence of embedded URLs and the nature of the link farm suggest the document is designed to lead users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://irlanc.ru/uplcv?utm_term=pain+6+months+after+c+section
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3448adafe4---36746241181.pdf
    • https://ivanamihic.com//files/32825389024.pdf
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090c6104e332---lojezinemikoz.pdf
    • https://fsbulletsandbrass.com/userfiles/files/nuxuki.pdf
    • http://ezibra.pl/upload//file/60598354264.pdf
    • http://freeski.hu/freeski/file/97313522407.pdf
    • https://zegabilisim.com/calisma2/files/uploads/56198180336.pdf
    • http://aarogyamedico.com/userfiles/file/muzinasipasanonubowi.pdf
    • https://alakharia.com/public_html/userfiles/file/74564462379.pdf
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c521c9cfef5---99202691594.pdf
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080ad9294a86---vesusiju.pdf
    • http://ingmarcofaedi.com/userfiles/files/30694552754.pdf
    • http://dagmare.de/userfiles/file/53282726180.pdf
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/grjrumdo966a3tr44r6cj43evq/20193779999.pdf
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608951075908d---wefanelilore.pdf
    • http://ikhmongol.mn/ckfinder/userfiles/files/29213824961.pdf
    • https://alexandrapanayotou.com/web/images/static/file/kefomesuvorevimutodutero.pdf
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a40ed7c3074---naxapelopimidimuvo.pdf
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/125t8hb799mq0i6fh148gtq3lj/giputewagak.pdf
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094dae3a31d3---81118767711.pdf
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160bb392b71615---67160842077.pdf
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a1661b22a8d---jelowegeporukegejur.pdf
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608197fa464bd---65228167601.pdf
    • http://tmtechvn.com/webroot/img/files/82966787163.pdf
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/fd281bdf8faef0e66ca8028ef34632a9/61892912805.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_off0000e7e5.bin
45e66e2cb77bd0926308762faaaf26356a317e70f5cba554f688823f3972541b
pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E5 18016 bytes
font_01_sfnt_off0001157f.bin
848fd47c67ba8c26718e0851914894407065f80dfc406ab7cbb08581f51382c2
pdf-font-stream PDF embedded font (sfnt) at offset 0x1157F 10724 bytes
font_02_sfnt_off00012dfd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12DFD 16792 bytes