Malicious PDF — malware analysis report

Static analysis result for SHA-256 1739c60df70e7f4d…

MALICIOUS

PDF

91.4 KB Created: 2021-07-07 23:52:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 5a2e9d954d9793f1b9022906d77d2046 SHA-1: 5ed0cfeae1a11b69ca210ff1634d2a0c759261bd SHA-256: 1739c60df70e7f4db30e54453c46ad669346538a27e61731775ad6f77f8a8b1d
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links to compromised WordPress upload directories and disposable hosting sites, suggesting it functions as a link farm to redirect users to malicious content. The presence of external URIs and the overall structure point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160e4feeeb0f86---76132679820.pdf In PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/kudbjpeponfrkbfa8i5g0pi60o/femigasibipo.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/050550195491.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072cdb5ec0a5.pdfIn PDF document text
    • https://cicadit.ro/UserFiles/file/movanijixabawi.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ce06534b077---74382366457.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/fe3ebd3b501dfc26f9621a65a85b43f3/73772165301.pdfIn PDF document text
    • http://sport-way.ru/img/file/raxak.pdfIn PDF document text
    • http://www.oneworldkarate.com/fckeditorimages/userfiles/file/49360000020.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/k715fve6cam1b092ns9hj4q1rf/xojedasosewigopifujonipaz.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c91bcf16db0---76874830469.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d7e9852455---5032824634.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/16ervo17ji6abedtctcudpipvr/25601319548.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160827f6b8eae2---jezetufifegemafifepilesuf.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f32b74d0f7---bixuketeliruvipofetuz.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/cc1da0dcbb6bbe0245738b6966bab521/fisatojezusalikifiditara.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/e96355222f9ca40c325ae6f518295286/25108489288.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/910773ed3c589e1df83176b2f9a45d2c/30329639584.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16090723b9c5c1---12491950332.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/fomusefezub.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/ojfn4cnehihtro39j5sqveed9s/54025177542.pdfIn PDF document text
    • http://metamorfoza-krosno.pl/userfiles/file/bafofexutomenozal.pdfIn PDF document text
    • http://balogmihaly.hu/UserFiles/file/nuvurubavafuduvapewura.pdfIn PDF document text
    • http://mnogonomerov.ru/uploads/file/busuruzuli.pdfIn PDF document text
    • https://unosms.us/userfiles/file/gigelev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=real+estate+photography+retouching+servicesPDF 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_off000101c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C3 17116 bytes
SHA-256: e19a96af00e053f508aeeaad2c2a8a0ff0b4abdf70db5dfb9cad7081b8384aa1
font_01_sfnt_off00012e3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E3D 10976 bytes
SHA-256: ec4906dd7270f6dd312f5535e3ed738350b98cdd0a0299151591e6219e4a35a4
font_02_sfnt_off000147c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1