Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fb2c1eb3eda38fb…

MALICIOUS

PDF

89.5 KB Created: 2021-06-30 08:44:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: bc1dc8faf75370e1bdfa39c36195b644 SHA-1: 99121ce12911574c6cb679157de60fdee8f5cb2e SHA-256: 1fb2c1eb3eda38fbcaa95b3585525882ba87b9c38222f4950eecaf84510f2711
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to PDF files hosted on domains associated with compromised CMS uploads, indicating a link farm designed to redirect users. ClamAV and ML classifiers flagged this as a phishing trojan. The presence of multiple distinct PDF files suggests a potential distribution mechanism for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609b46768a6d7---wumigatuwenoroxujam.pdf In PDF document text
    • http://arcomproltd.com/userfiles/file/91458985685.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/230d72d227138dfcaea8f78b57f29f67/37464044396.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/f594e6294d0ba2589da7c576461a7794/27967175656.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5739edbad3---vologelobunox.pdfIn PDF document text
    • https://didacostruzioni.it/userfiles/file/pebumebew.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160d6ca240db22---89932146180.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d437f9827d---baretuniwowilodemumul.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/420feb1dcb73a2956affe72a6a90b4fd/45511962491.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/61c644147dfb800fc25154c49e18bd17/46487918881.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/6c8364cb56b90c0b3c1054ad66801dc7/zanawive.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/30597dbcb7994f69e1729d464b7f9caa/78803112365.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/d858edbf3480d8366057ae71e0345c09/4992567425.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c84d49a06f1---88241674929.pdfIn PDF document text
    • http://nhatngungoisaoxanh.com/upload/files/jeduz.pdfIn PDF document text
    • https://haltia.mx/sii/ckfinder/userfiles/files/41314547212.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/jazezufuzulekubefuwuwov.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c043db1946---tibupotet.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/9nfqel2cavoa0jhsm7gp68533t/gesig.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210526175234.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/tupezavosune.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/054d0821ed70ae9eb210bb1bbee20a3e/gusatuzobibajirirafe.pdfIn PDF document text
    • http://biotop-zamosc.pl/userfiles/file/30221244961.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/fd0d912ab47e4d0253f7f9ede3f442c6/41892822913.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=vocabulary+workshop+level+e+unit+3+synonyms+and+antonyms+answersPDF 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_off0000ea75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA75 21748 bytes
SHA-256: 04d7bfb8b8e3e0393015a46e8b4d345a55ddf322ba5cb15f9a9076e120d677ac
font_01_sfnt_off00012285.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12285 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013a9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A9C 11520 bytes
SHA-256: 99bfb7037cfb7b4466ec7b8e82a32766a5948e235061e297cc963864314d789d

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