Malicious PDF — malware analysis report

Static analysis result for SHA-256 71e009c499debd09…

MALICIOUS

PDF

85.7 KB Created: 2021-08-02 03:01:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b6fa1a2db784b539b7c8674990692c68 SHA-1: d05dc28d40d877096eb7bbda80ca8372694bdb35 SHA-256: 71e009c499debd09690c3bdae69a91f877d171618c027eefda782e0f7ad35308
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous links, many pointing to compromised CMS upload directories, suggesting a phishing or malware distribution scheme. The document body is unreadable, but the heuristics and URLs strongly indicate a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://amuseonline.com/absite/userfiles/file/94811569353.pdf In PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608612d4c27cf---16597145878.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/92315763904.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/dc93d4ab9e6ea1366c35487b0b47f6fe/depipanisupubilukab.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/291f5c51beaefe8e3e505b666e87c037/36455850724.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a64bf67ab7a---xuwusaroz.pdfIn PDF document text
    • https://www.geo-decouverte.com/ck/ckfinder/userfiles/files/14323794362.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/10af5fbba1ac52879721e3eb635dfef7/nogeriwi.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/74799998794.pdfIn PDF document text
    • http://gymostrov.org/gymostrov/userfiles/file/mozoxivirisevu.pdfIn PDF document text
    • https://clickkedai.com/userfiles/file/velorevuputagif.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076754db6e57---pigumafisuvaka.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/finabaxiledovikofewotibu.pdfIn PDF document text
    • https://www.wroclawmodelshow.pl/ckfinder/userfiles/files/gukulovuditik.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210513044210122.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/k1abj15072o95b5oo6r61pukfm/85984839680.pdfIn PDF document text
    • https://www.winsum.frl/ckfinder/userfiles/files/273258466.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/buzidedusokupemanal.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/f01cuucmpu4bs2eoe7nv560kb2/dasigapuxojajepusulusuzi.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/bf6662941e32a171dd0509ba674f599a/rosodovabaxopevi.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/16080e969c1172---todezabulujibudu.pdfIn PDF document text
    • https://sanipacific.com/attachment/file/55744203215.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d205e0cc7b7---lirekisetigiz.pdfIn PDF document text
    • http://scbczy.cn/up_files/file/20210716_155749.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=dragon+city+mod+apk+unlimited+money+and+gems+2020+an1PDF 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_off0000e9dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9DC 11456 bytes
SHA-256: ca2295d00a6fff7156591c609b836f5141551905b43ef5362a4280738e1be9a2
font_01_sfnt_off000104d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ce9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE9 17056 bytes
SHA-256: 8c0e66da547e23b0bc7be3350a28dc47f45bde0dd767a395dea059f46662bf2d