Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7b8d0bbebf98aa7…

MALICIOUS

PDF

88.9 KB Created: 2021-09-04 11:51:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2df37e550c45ed387193804a3e14bc1c SHA-1: 50d75b2c215b5ef7a9f1d9c395940e4ce8800446 SHA-256: d7b8d0bbebf98aa781635aa910f27c9702e8bf557fd5472ee66a95b470d69f86
164 Risk Score

Malware Insights

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

The 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, with many URLs pointing to compromised or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of a 'download button' lure further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

Heuristics 7

  • 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.
  • 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 https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/bc84b3f57a5ddf028c0679124764546b/51458261379.pdf In PDF document text
    • http://vsrru.ru/userfiles/file/64984401593.pdfIn PDF document text
    • https://irantruck.ir/data/file/fijuwibufovarukedixozati.pdfIn PDF document text
    • https://digidatadecolombia.com/wp-content/plugins/super-forms/uploads/php/files/304425b3b090530cd2aebffca81907db/97111700810.pdfIn PDF document text
    • http://demenagements-remond.fr/userfiles/file/20210828232017.pdfIn PDF document text
    • https://tauthuy.vn/upload/files/sujodokigefodefopofupo.pdfIn PDF document text
    • http://popnmusic.fr/userfiles/file/77856989922.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/55681749721.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/84025172324.pdfIn PDF document text
    • https://twinslock.com/locktactyuma/userfiles/file/5892501573.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/mguc47ptg7i2anoaju2djfj75r/32666695088.pdfIn PDF document text
    • http://songiadahoaian.com/upload/ck/files/wimuvas.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085bfd667955---46630057342.pdfIn PDF document text
    • http://kozmetikadunakeszi.hu/userfiles/file/vubixolerik.pdfIn PDF document text
    • http://stalmont.eu/userfiles/file/77861760653.pdfIn PDF document text
    • https://rijst.nu/userfiles/file/12170192045.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/qvem0p0mv3apa8ti5u4erjha8n/bexarafimatojex.pdfIn PDF document text
    • http://elisa5888.com/shopadmin/upload/files/baxibef.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f6a8faf1ca8---75070643912.pdfIn PDF document text
    • https://ebooksweb.net/files/file/42418327948.pdfIn PDF document text
    • http://gospel-pour-100-voix.com/fichiers/newsletter/file/dukupekovofejodepibeto.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/uvmrs5kl9uc96a1tpb2mke90nf/29791343053.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=desenvolvimento+e+aprendizagem+motora+pdfPDF 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_off0000ef41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF41 21720 bytes
SHA-256: 3645113b51cb0ba63c7938addfd89f59f4abdcc55063bc1247249ae5b23f1842
font_01_sfnt_off00012448.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12448 10968 bytes
SHA-256: b9a737dbead3984b2ea68a3b3752195f93bd5a9739b76c8a3fe02b51a5e89ea1
font_02_sfnt_off00013d95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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