Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c63e8db3c8d2243…

MALICIOUS

PDF

85.3 KB Created: 2021-06-29 01:56:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 321f12ec42d9a3e907d49ebe661ae5a3 SHA-1: 3d9a3f27276a010d21a63676b8096ae50e6d02cc SHA-256: 7c63e8db3c8d2243357f2ba22e0442e4db1cc1e9d8481b0701354c0c15a2ed11
176 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan. Multiple heuristics indicate it contains a link farm pointing to compromised WordPress sites, likely serving as a lure for phishing or malware downloads. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/50oq40fmhfm6e0cojh57nfuvqc/9464469585.pdf In PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/vos6co53nhsolvl9pr60frqe73/zotevoned.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/0307377f267b48daa9cb7cbbe171469e/65362097242.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/juluvimipobomipi.pdfIn PDF document text
    • http://sivam.pl/files/file/22532867601.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b6d1b84566---bezosesilumokumubupek.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/e85f6b9b29a71a349248d3fc679a898a/2956268154.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/bb51b5b54f149e55b075d3efbb89e514/lokutovupofavuwanokovozab.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/2547a9f65bb21897673e9333f93dc1d5/vovazoverusugadelapivuwut.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/09652a5rkr6ldj02j4t1g87t6c/powowuvivufisivurusejesa.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607872ae1d0b0---88737299318.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/16075d38f228a8---89914619153.pdfPDF link annotation
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081e4a597524---6681317441.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a861509190d---96191765843.pdfIn PDF document text
    • https://sunwayhk.com/louis/STARKGROUP/ckfinder/userfiles/files/66953471128.pdfIn PDF document text
    • http://barcelonahotel.vn/UpLoadFile/file/12446117172.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160846ca200110---biponor.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c66abc5aac---besowaw.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/23af5579be4c11b9b853f28052677caf/sebatenigas.pdfIn PDF document text
    • http://svazekobciorlice.cz/userfiles/file/43660593642.pdfIn PDF document text
    • http://yfatc.com/userfiles/file/58469438957.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/b886fc18fc40560b51de532dcbfbcce5/43603419602.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/605a8c7384be79227d0efca773ee4fe8/bowejoziponipeligozelurar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=selected+disk+has+an+mbr+partition+tablePDF 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_off0000db33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB33 29084 bytes
SHA-256: 3055c5ce4daa2531255c3e1e8c929b3f8c53343dd7c32182d7f616be25a4ed03
font_01_sfnt_off0001149f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1149F 11084 bytes
SHA-256: 584f3f75f26f85a40c009f9bce8be544096d60d6f2a24ed03b3daaf7d766d3ed
font_02_sfnt_off00012dfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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