Malicious PDF — malware analysis report

Static analysis result for SHA-256 16ba7a90ea1d6d0e…

MALICIOUS

PDF

88.2 KB Created: 2021-07-17 18:23:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 50c99fa48ababa4bb2135dfe51c77272 SHA-1: dec55ac5c687ae6af4459b8baba4580a16f5fb13 SHA-256: 16ba7a90ea1d6d0e2cdbdeec9ae6153ffe5c0a4db436d19d67adf53e58eb0a0d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely serving as a phishing lure or a distribution point for further malware. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or content redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/2f17ed1f1e72f5269511792c0f0368e6/lilovawenedeba.pdf In PDF document text
    • http://chupanhnoithat.vn/upload/files/72501476375.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/282241208738.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/fv2tpb74mvhec3rnv8ffsu6ph1/65170746623.pdfIn PDF document text
    • http://rialta.ie/userfiles/files/61677372743.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/4i10cili6ev32pr4atj1nhn2f3/62659080129.pdfIn PDF document text
    • https://actor-conseil.com/files/file/vemufeb.pdfIn PDF document text
    • http://business-plan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/63770215914.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/83aa58576cb54672b04e0455cf728992/81977322811.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/160901c0aea9de---rirevenekukebi.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/58g166986oht1f4v5vfv85lsbr/20384258137.pdfIn PDF document text
    • https://jkmart.net/FCKFiles/File/44912300213.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16084cac70460d---8826430852.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a6d4e299d4---86727206871.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/30ttv1kogrcshskbgi43d5m6a5/74180628507.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5050f538b9---venanatevuvudozerolalit.pdfIn PDF document text
    • https://mimpishio1bet.net/contents//files/60572955327.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160864b6fea721---lowufebux.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/1627c6a40e8aa042af11ca184f49212c/57710157490.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/16081055e56fdb---34866263441.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160c0d9bacf15e---24929670379.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/ac1a84bb581e5e7071a37f31b6ef76e7/84966609254.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16093f61178220---fixuj.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb40724dec---lebewajekogabaxeboxit.pdfIn PDF document text
    • https://hanmarklight.com/UploadFile/files/18814513776.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=postdoctoral+fellowship+in+computer+science+2020PDF 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_off0000ed08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED08 19904 bytes
SHA-256: b4928278304cc05edcd2760f2484e5130a4456b83c6c711aac5aa555dfdb233c
font_01_sfnt_off000120a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000138be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138BE 11316 bytes
SHA-256: 6bd7a0daca1f145128dfb696ed47df9bbaac726a12d6694163638c7317a3212c

Open this report in the interactive analyzer, or submit your own file for analysis.