Malicious PDF — malware analysis report

Static analysis result for SHA-256 e388fdb9cefde74d…

MALICIOUS

PDF

90.9 KB Created: 2021-09-04 04:56:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 91ac8511910be2a84ceeea8c226efe6f SHA-1: ca17cd30c649a6c3e6a0deace89a971baa2b3152 SHA-256: e388fdb9cefde74d751bcd0ceaf2a04aa03ec2bb3a935490608409d270baad54
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS platforms. The presence of numerous links, including those with 'utm_term' parameters, suggests an attempt to manipulate search engine results or lure users with specific keywords.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/8990b6f12f61496579e9aaa319a98b3f/6140661708.pdf In PDF document text
    • http://canavesiobruno-architetti.it/userfiles/files/pufazizomijobepumopet.pdfIn PDF document text
    • http://teknis.it/userfiles/files/xoromemubojixalimip.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/raboto9famf2fgvn5g9dmsqjha/garow.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607d07a25cad7---vemujufikatidewisajogurud.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcf18637001---59203742846.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160cab1c63471c---paxaboxidogujuvibekipari.pdfIn PDF document text
    • https://handientu.vn/userfiles/file/79677199362.pdfIn PDF document text
    • http://orem.mn/uploads/files/31499216165.pdfIn PDF document text
    • https://photofetimages.com/1931579330.pdfIn PDF document text
    • https://dla-pracownika.pl/pliki_user/File/tilegiw.pdfIn PDF document text
    • https://drlanda.hu/user/file/rifotilumubuxupowofa.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///zebajiruwarizibitawi.pdfIn PDF document text
    • http://aviteksural.ru/admin/ckfinder/userfiles/files/9466895838.pdfIn PDF document text
    • http://pattonbrayboy.com/clients/8/84/8444fd18e659e4cf0f5d78ff5dcadce3/File/rupirumaziradojowa.pdfIn PDF document text
    • http://alkanboya.com/files/file///tibazusilija.pdfIn PDF document text
    • https://360clothing.in/home/www360cl/public_html/uploads/images/files/49976405077.pdfIn PDF document text
    • https://gbp.dropship-online.com/userfiles/files/nobaloxalaxajilokofiwefa.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087906f8ee85---82467422893.pdfIn PDF document text
    • https://mimpiindah88.com/contents/files/93160345830.pdfIn PDF document text
    • https://beaszemin.com/files/25802475192.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/c1bf732468dc33910aa94ede6d1ef9bd/4033364761.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=visionaire+airsep+manualPDF 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_off0000f995.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF995 20328 bytes
SHA-256: b4870704952d7b4e482e99d99d45ad079319711aa753c756b39fb89602b576d7
font_01_sfnt_off00012d50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014567.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14567 10384 bytes
SHA-256: 18f4924e22959ec24138648da77a58a347df9f629b25a0d5a23f55170cbe764a