Malicious PDF — malware analysis report

Static analysis result for SHA-256 53df8fa541805701…

MALICIOUS

PDF

84.1 KB Created: 2021-08-14 23:41:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9e92e49ca417f3b5a9c159657275a085 SHA-1: b6d504e6fbd782f1b297985e13aa33a9df4c21e9 SHA-256: 53df8fa54180570109f3a38b61bda15b12b6ff12d45a26568d9a0a2a0a98b785
156 Risk Score

Malware Insights

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

This PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The primary lure appears to be a "cost management plan for construction project" to entice clicks on these URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://chcial.ru/uplcv?utm_term=sample+cost+management+plan+for+construction+project PDF link annotation
    • http://olsztyntransportmedyczny.pl/userfiles/file/19507581243.pdfIn PDF document text
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/guvene.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/f06345227261d5435afad3e5ff776a16/52808852738.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/22f3d2c31719ab98b10393637ec79541/riwizak.pdfIn PDF document text
    • https://carrieres-pierre.com/userfiles/file/10115834904.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/h5h2ihiia72jnj5hbhs6g7sqh6/48912897695.pdfIn PDF document text
    • http://sskj.pl/userfiles/file/7074039547.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a433aa0251---19031254091.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608e2ea9e561e---86178275693.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce9f40c648---47551425244.pdfIn PDF document text
    • http://robbes.nl/media/files/madodef.pdfIn PDF document text
    • http://innovatepc.com/userfiles/file/tasevo.pdfIn PDF document text
    • http://tienhasteel.com/app/webroot/upload/files/bepigakir.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086668ae5eef---84424441440.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d09277d4ca7---viwilib.pdfIn PDF document text
    • http://nebovsem.ru/app/webroot/files/files/zuwaxut.pdfIn PDF document text
    • https://m-astar.com/UserFiles/files/26547847024.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/mooeljppt82gdbk25ugtdkngba/86113912538.pdfIn PDF document text
    • https://artgreen.vn/attachment/files/29876946763.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071f706313ac---8302602801.pdfIn PDF document text
    • http://amghanoi.com/images/ckeditor/files/87994395349.pdfIn PDF document text
    • http://seamacros.com/upload/file/gopedixenerijivapojexo.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/24f4a9e04d1cc3d428b223c8c11d9392/10651151790.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_off0000e543.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE543 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD5A 11128 bytes
SHA-256: 0ae838d5642d1539eec28d54915f430d05706722579065868687bfb4febb7143
font_02_sfnt_off0001173b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1173B 16596 bytes
SHA-256: edb5e53c57ae9cade7072f480640fb1466c687c5bedf74a2a6643b508f0e6e02

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