Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7f0c38abaae4726…

MALICIOUS

PDF

85.0 KB Created: 2021-09-06 08:24:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: b65bd4ab675d5346f4dc7087babf8c8a SHA-1: 1f05aea4ebabe0500334dbb582c2bc292755fdb1 SHA-256: b7f0c38abaae472686f771b9d7299b68335e82947ac740bad7e3e7674d63bb1e
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to numerous compromised WordPress upload directories across various disposable domains. These links likely lead to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c854ce05728---regitojupel.pdf In PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4cd30e1087---nujikekitutuviwa.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ad6212cb4ec---lalogiwak.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/37e957f1a53eda9c9e2922908e11ecd8/biwowutim.pdfIn PDF document text
    • http://bigandtallking.com/userfiles/file/weredefowepojitukozibag.pdfIn PDF document text
    • http://bankerz.in/qpic/files/86001987956.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160778fd90348e---bujuvelag.pdfIn PDF document text
    • http://futuralagoparking.eu/userfiles/files/58754115578.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1612e6277beaeb---lafulifowamofasinen.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/13656367328.pdfIn PDF document text
    • https://vilnius.cvzona.lt/resources/img/files/47885799131.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/98199791974.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b24749cdb81---57039582907.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607ede07432a0---sedojata.pdfIn PDF document text
    • https://apartmani-mestrovic-krk.hr/files/jepom.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160756e047efeb---86738696665.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c71b62c133---14895274334.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/jijenemawigoganeropotozef.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b83ccd29e6---wivosonogemivujatoze.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/76320c7ab5e26de8374d9db48c316695/jiwaludavizimedumeziva.pdfIn PDF document text
    • http://carlaschroyen.com/content_docs/99250216516.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/affab0dbfe166fdd82d7cd97545db8ad/koperedodabomef.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1610ac16a94ff7---92526368144.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160909eb1db6ba---60254247786.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=uhc+mycare+ohio+provider+manualPDF 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_off0000e313.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE313 10800 bytes
SHA-256: 336379022715f0a21eaf32f08cf629de4185adf4984de6ed4406dc765943e88b
font_01_sfnt_off0000fbba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBBA 18844 bytes
SHA-256: 0aa4e73cb1e1ccdbfc31bb724efa5ae323496f55e6bb87629ee04176d5f9ed5a
font_02_sfnt_off00012ca4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1