Malicious PDF — malware analysis report

Static analysis result for SHA-256 77b24d069b5ffc4f…

MALICIOUS

PDF

122.1 KB Created: 2021-06-27 18:12:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: d6b74578dca16568371c7fad39f618aa SHA-1: 67995532091c75cfdcdd01f6fa097eef7e837eef SHA-256: 77b24d069b5ffc4fa969aa27a63070cb3bdb4b8964d94d79f273258de262696e
124 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by ClamAV. Static analysis reveals it functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites. These links are likely intended to lure users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4451

Heuristics 5

  • 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
  • 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://altonika.pro/files/fck/file/fisulutusuzidadusi.pdf In PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/39a5b5dbd1ae92c298f45278e255bdec/xirulukikikegikemilez.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/6315000313f884437db81a5b78df514b/komijatuga.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f4d519401---vosenedexekonuzej.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609650d465f45---famowibatuzojut.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e3ca4fc10---11093885351.pdfIn PDF document text
    • https://xn----7sbbjg7ctfs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/73020714a868fb06fbef4ccbd1a62507/98770422146.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/16073ecf96ad38---lojuxuxukolenuduxefuwo.pdfIn PDF document text
    • http://havefuntogether.com/image/upload/File/30744811103.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/a34806fd6bdb5774a13f97561b5cdcb6/64213132201.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609e7ab32732c---vikap.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/411ddbbffbd04b669199830d6e3f6694/nopipudemolakukapimijoluz.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/t864iji9c64ldjjovs91brpm4c/41647228119.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e7bd9796f5---59530143419.pdfIn PDF document text
    • http://fritz-fahrlaender.ch/download/jiwufu.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/9e379cf33f0b8824e9bd14a6ccd49277/jubolob.pdfIn PDF document text
    • http://businessdevelopmentcenter.pl/uploads/userfiles/files/43297861917.pdfIn PDF document text
    • http://habitat3.eu/userfiles/files/51759911978.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b611ab8600e---66584369766.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160710091b151c---bufepavofule.pdfIn PDF document text
    • http://shukokai-voves.fr/userfiles/file/xirovod.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/2758aff73964d85628ac88ecbcb6bc90/nulisorerixevesalosa.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cd91b8c4515---29847815715.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f034576dff---vepirudukozufuwesosev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=rp+received+pronunciationPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001840e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1840E 24048 bytes
SHA-256: 741be56b66599540312bd75f1627419f03ef79bdaacb5524e1dbe84501819ffc
font_01_sfnt_off0001c338.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C338 10504 bytes
SHA-256: 8591808cdbd8b2658d4264314789e10738adc19eacd3ef93d0de1246199c0b25