Malicious PDF — malware analysis report

Static analysis result for SHA-256 de16fb8b819e71b6…

MALICIOUS

PDF

80.7 KB Created: 2021-09-18 01:30:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f863aa1c3069927196a61b7d7871f14d SHA-1: cd0b814b020cc6ca68127e77e3b676b8ea3fea16 SHA-256: de16fb8b819e71b665db5e3617a2387a148077e33a9d74bb56f584b0b316bf31
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to numerous external URLs, many hosted on compromised or disposable domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious activity, potentially leveraging embedded JavaScript for exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • 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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://jaqalsports.com/files/file/tugajikisode.pdf In PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/c7e64d00b21c04eb8b2a5811c9faf783/zolojufuz.pdfIn PDF document text
    • http://arucax.am/user_images/file/nudabulisenofitapelexelo.pdfIn PDF document text
    • http://artetendasud.it/userfiles/files/53259034118.pdfIn PDF document text
    • http://sunway.me/ROOT_PATHuploads/file/061502091238.pdfIn PDF document text
    • http://email-database.info/userfiles/file/72739453480.pdfIn PDF document text
    • http://immobilieninvestors.org/userfiles/file/88203556181.pdfIn PDF document text
    • http://studiomarazzi.eu/userfiles/files/25866450726.pdfIn PDF document text
    • http://galettedesrois.hu/userfiles/file/fezuginevoni.pdfIn PDF document text
    • http://benhvienlaptop.biz/userfiles/file/55720232340.pdfIn PDF document text
    • http://strojsteel.cz/webpagebuilder/ckfinder/userfiles/files/59019396807.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613384d1d4660---nudefisoxamipofadojubik.pdfIn PDF document text
    • https://eko-briketes.lv/userfiles/files/wanefuxoraderujajiraz.pdfIn PDF document text
    • http://turatabor.hu/media/77106083134.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/26d735e49dd7b538652f445f5067caf9/80792182541.pdfIn PDF document text
    • https://northcoteplaza.com/userfiles/file/60514295262.pdfIn PDF document text
    • https://hinodanang.com/uploads/image/files/zitofezipobidom.pdfIn PDF document text
    • http://mentor-tutor.com/newGroserLikeProject/uploads/files/bujuxujuni.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/0759fadf5ad8de0c12dab2e4fb89ce8b/59222245225.pdfIn PDF document text
    • http://studionegrelli.it/userfiles/files/jikogiverugaviwajuja.pdfIn PDF document text
    • http://appinaris.net/ckfinder/userfiles/publics/files/zabexikokoromawejore.pdfIn PDF document text
    • https://ensegun2.com/ckfinder/userfiles/files/44463627237.pdfIn PDF document text
    • https://textosl.com/upload/editor/file/245255687.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=32+bit+pubg+global+apkPDF link annotation
    • 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_off0000d626.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD626 10452 bytes
SHA-256: e6c037c4a031b8eb03b9896e6488d664c5291d9e424c2d937ec0bb1309338b0f
font_01_sfnt_off0000edc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000105d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D6 18340 bytes
SHA-256: 9fdadd48164e869de09484008c81c852d5787875306b1f2d76a8a9fe9b59e0a5