Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b030d507b2b6d4f…

MALICIOUS

PDF

92.2 KB Created: 2021-06-30 08:02:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 93519fa6362baaa7da9f3d9f5a65b140 SHA-1: 84d09ac0ca367a19db82306614e7255eb1a96961 SHA-256: 8b030d507b2b6d4f6d6a67d63c8b94d12c600524f44d388811dfe6d7c77962bb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links to external websites, many hosted on compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://infrive.ru/uplcv?utm_term=animals+of+temperate+forest PDF link annotation
    • https://advantagelic.com/singhania/downloads/file/43331611123.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/sisolixixiji.pdfIn PDF document text
    • https://daiichigroup.net/uploads/news_file/2375233467.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c27035b10---bufedo.pdfIn PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/pawetolavovunivitabet.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609adc4f8ca4b---1205548029.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/gaur9322ne10vc0mqedvbmjtlp/72261414618.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a529b2a097c---xusoxanijimog.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a3958a66a80---84328784818.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c84ce9dc157---sewanoluxuza.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/e7ae269b9fdc5560d3d6a133c0cb5fb9/98505734645.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/33889046843.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7e85b2425---58712513105.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/p1gb32rolgou76hvl3fqqjjs5m/26577999142.pdfIn PDF document text
    • http://deauville.ru/files/file/zeladunen.pdfIn PDF document text
    • https://beauti-full.ru/uploads/files/27869327972.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609c1e777f04f---wegudad.pdfIn PDF document text
    • http://erbaytag.com/resimler/files/17021328719.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f236ca6c76---botuzevanopiken.pdfIn PDF document text
    • https://n-v-v.dk/userfiles/file/wusekovozavu.pdfIn PDF document text
    • https://norservis.com/files/files/weganijudolurusatam.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/5tsgng9lnv8dv0v7lil8g0qobq/sokebuxu.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac91682c2cf---kikofegusojarunegero.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/userfiles/file/32019263166.pdfIn PDF document text
    • 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_off000107bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107BF 16980 bytes
SHA-256: 96a25e9ced18604650b60f7919bf52e8f8c593d2eaa52f6cb13e4cc3e67d39b1
font_01_sfnt_off000133ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133ED 10500 bytes
SHA-256: 31f626dcf75615a82a0964deaf0d43b4dd863f0c767564fb311d1e9f585d1fce
font_02_sfnt_off00014bcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BCD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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