Malicious PDF — malware analysis report

Static analysis result for SHA-256 f10c6bafa8057a46…

MALICIOUS

PDF

83.3 KB Created: 2021-07-13 21:17:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2594b5e092af964775818ec847f14c06 SHA-1: df021bcf15d0f3af3b58636738dabfaaa454a237 SHA-256: f10c6bafa8057a467c7fce84d99005de847392c777c57d697a7b9fb20722a2b8
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external resources, many of which point to compromised WordPress upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a secondary payload. The presence of embedded URLs and link farms suggests an attempt to redirect the user to malicious content, aligning with a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://tvsporedi.si/vsebina/lejijipopo.pdf In PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078aa6242aaa---12945231908.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/44369470327.pdfIn PDF document text
    • http://cuoredicane.it/userfiles/files/92085754822.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6907937e301118318cf9546f1d89237e/gunagiwipoxawugenutakukez.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210627121348.pdfIn PDF document text
    • https://anfauglir.com/images/file/88905451699.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/9403811189.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/na8jpeida66n8g09s18i3qasv4/risuvifazaz.pdfIn PDF document text
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/414ef6a5818a3ee819602f5adc2daa1b/50705913594.pdfIn PDF document text
    • https://anandamsanyal.com/userfiles/file/birizipegosinone.pdfIn PDF document text
    • http://chataphan.com/file_media/file_image/file/67228338342.pdfIn PDF document text
    • http://ddservice-bmw.pl/userfiles/file/vezotoxebeboxifu.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/37ae51267f17c8d4df20cebbc0ab9a54/beninotitemomaxibivupa.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b22b85e93bc---rotukedozevenuko.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/530r9ulf7njfn6jf0ord5qq7t0/vokiwugako.pdfIn PDF document text
    • http://ambulatorioveterinarioscapindandrea.it/userfiles/files/33198742769.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dd785932eba---zaretatapuwivizo.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb26c693bb---71520334231.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/b4482f415da4aa038da0a3d2c9cff6fa/24629178763.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160794678dc03f---kufewapozozekipenutafafaz.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609b9ec3f06f4---82421921111.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a0808772722---fawonegop.pdfIn PDF document text
    • http://bazis-expertiza.ru/ckfinder/core/connector/php/files/2710299293.pdfIn PDF document text
    • http://auburn-properties.com/userfiles/files/vusulenokavijusupowule.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=troll+face+emoji+copy+and+pastePDF 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_off0000d329.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD329 10988 bytes
SHA-256: d17b88a17f9107fe72a1561103fb28fb583fc2f6a3fdc3a5f2a9dd02dbff669c
font_01_sfnt_off0000eca7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA7 53852 bytes
SHA-256: 1e497205ef978bb0fd5438bbca3f17c8a6a304c9137bc4427df90a6a953b0199
font_02_sfnt_off000127fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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