Malicious PDF — malware analysis report

Static analysis result for SHA-256 c545cd5347be0cba…

MALICIOUS

PDF

81.6 KB Created: 2021-09-06 03:22:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a645f59f46065f206c4010ef62f7bc81 SHA-1: 464a203b4922d7ab1e530dbe532cff219f07467d SHA-256: c545cd5347be0cba11ab625db14232afb75a1addf5c6ff434dccaed732512e3f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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=epocas+literarias+pdf PDF link annotation
    • http://fruhmann-elektrotechnik.at/96509073615.pdfIn PDF document text
    • https://rugsinc.in/UserFiles/files/sufuba.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608c98d6a6a94---roropikosotosawil.pdfIn PDF document text
    • http://ansonseatery.com/uploads/files/65638960704.pdfIn PDF document text
    • https://apartmani-mestrovic-krk.hr/files/2336125167.pdfIn PDF document text
    • http://ayhancevik.com/images_upload/files/nuwekimonurofikuragojofil.pdfIn PDF document text
    • http://rustproofingottawa.com/userfiles/file/texesalitotovevor.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/93087008183.pdfIn PDF document text
    • http://bosch-elektronarzedzia.pl/catalog/file/29087597185.pdfIn PDF document text
    • https://ketdoanbus.com/webroot/img/files/zemumufavidetafarudowato.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfba707129b---69774963534.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/files/xelib.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/16072d4b75a297---87575006929.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff57644bb0---piwigodejufogowafojolos.pdfIn PDF document text
    • http://szwygs.com/upload/rupinedetulavilonebusow.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1609595929e9d6---ginuwizuwefuvune.pdfIn PDF document text
    • http://www.ks-klinika.ru/ckfinder/userfiles/files/68013792516.pdfIn PDF document text
    • http://cuanhuadanang.vn/uploads/image/files/magibizivozele.pdfIn PDF document text
    • http://bassbasement.org/userfiles/file/wavesilikip.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/5743f46bec60de10b570447dcd833e3a/61895892203.pdfIn PDF document text
    • http://dragonspond.com/uploads/files/1953956357.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/q7bdf14tihghkkqfiq10a5u830/pugevemidibulap.pdfIn PDF document text
    • https://birudongker.com/contents//files/25907032984.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/538f7df243ff0b5eaa337ef30b70cc62/zujulaserad.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_off0000d802.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD802 19284 bytes
SHA-256: 1bf0cc167c977f93a5d3e7c4baeaf660cb615601bf3b353e96c64ace02f8fc52
font_01_sfnt_off000108cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108CC 10492 bytes
SHA-256: 4ac7a6f2171c2df7482fb3fefd192e70ea5037b3553c84d352418ede1f854f46
font_02_sfnt_off000120c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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