Malicious PDF — malware analysis report

Static analysis result for SHA-256 d365a1300c0f963c…

MALICIOUS

PDF

85.0 KB Created: 2021-07-01 13:11:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a957fdc804e870ec263979ecca40acb0 SHA-1: 78cac4ca4f679fd593b639438d3e6fd6748fc091 SHA-256: d365a1300c0f963ce18e29e47f2e58075ecba7623521a61d266484d6d68d26da
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were directly extracted, the presence of numerous external links and the overall structure are indicative of a phishing lure designed to trick users into downloading further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://verandapattaya.com/userfiles/files/44370621615.pdf
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160876f266e42f---mirajafikidosirivibem.pdf
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/1548da64126e5cf425512fa786ffc3db/19202257293.pdf
    • http://shosholoza.de/file/74578186633.pdf
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/324cae76b9bddcffd0a9be9e22b8831a/levopuvowiv.pdf
    • https://misionesmedellin2030.com/wp-content/plugins/super-forms/uploads/php/files/37r6bh0nmtilfl7lketudh1fvg/91651547380.pdf
    • http://thepducphat.com/upload/files/derepoduzu.pdf
    • https://ctapigroup3.com/contents//files/dupunapuzolaziza.pdf
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0be2042e0---10316958599.pdf
    • http://www.findvoters.com/userfiles/file/suvinatizojelijukafefaw.pdf
    • https://prolocolidodisavio.org/ckfinder/userfiles/files/47554699067.pdf
    • https://oilbasaro.com/web/images/ckfinder/files/20210630042622.pdf
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/d4d06a627d00b19ebdaa4b8102be204b/dabinixunivi.pdf
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/71pq7qmr6g3f9v6jf24i85q816/sidifosenusunewiredow.pdf
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160785f714650c---direteretemifad.pdf
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f732176d1d---75935697719.pdf
    • https://astek-telem.fr/userfiles/file/2719043989.pdf
    • http://coffee33.ru/archive/file/46441564102.pdf
    • https://ambulatorioveterinariosismondi.eu/file/zulorot.pdf
    • http://foto-klub.dk/userfiles/file/36289905962.pdf
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bb1d39ad6b5---89948917942.pdf
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/e1b959c0b09f959c531c8f6a250b4afe/98155385232.pdf
    • http://innospectrum.eu/hirlevel/file/sudepogufadi.pdf
    • https://banktapeunadana.com/tapeunadana/bank2/admin/userfiles/file/70627406083.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=turmeric+and+overactive+bladder
    • 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_off0000eb99.bin
2edf0570d93d8b5b30d301e3edd500d42c17713a851b8a845086d8fb1cc8c867
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB99 16436 bytes
font_01_sfnt_off00011649.bin
a5942b0f2705bb6ec88c60fb61e8c67da34452750d9181184dc1499c68ee4e6d
pdf-font-stream PDF embedded font (sfnt) at offset 0x11649 10632 bytes
font_02_sfnt_off00012e92.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E92 16792 bytes