Malicious PDF — malware analysis report

Static analysis result for SHA-256 5746f08330d2db97…

MALICIOUS

PDF

80.9 KB Created: 2021-08-29 13:45:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1ce385f583cacdf6b5df37e8cf09ed7d SHA-1: 77ce3d5f55cec61cb1f41855967efb635ef30476 SHA-256: 5746f08330d2db97153170633de8aecb8c5b281cea8ba585e8ccc1f065d9af16
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to various websites, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The structure suggests a link farm designed to obscure the final destination and leverage compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • 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 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://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/fe5ltk7t2jc1e2j7ia78r4rpcp/87263132511.pdf In PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/nivoxitipunixebifabogoner.pdfIn PDF document text
    • http://thecreditcrisis.net/clients/73966/File/78851818070.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc75504298---37725136305.pdfIn PDF document text
    • http://nationalcoopadvisors.com/userfiles/files/dubupavib.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/3af31beb37381e7b8a4152c05328ad1a/dozajadalu.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210728/file/gofederutasifedute.pdfIn PDF document text
    • http://hongdacable.com/d/files/23699666170.pdfIn PDF document text
    • https://myshalewell.com/userfiles/file/73720130724.pdfIn PDF document text
    • https://arerp.kr/data/file///taroxepasena.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d3dcd2b1da---69537326266.pdfIn PDF document text
    • https://istanajpdua.com/contents//files/mamaluzuvemejud.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/61534179824.pdfIn PDF document text
    • http://france-ex.com/images/blog//file/liwowozefoviwu.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ad641a4b905---77211441111.pdfIn PDF document text
    • https://rubin2000-distribuitorshop.ro/userfiles/file/sipogebofibemowulom.pdfIn PDF document text
    • http://yanartextil.com/firma/files/mutepofuxav.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/dt6qamhvvr2hhmid7red5kgju3/pabemapomadujanoz.pdfIn PDF document text
    • http://51www.org/uploadfile/file/03bb5d1567db96df44b43313c18c9b56.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160fdf23b7bfd7---noferopimoxix.pdfIn PDF document text
    • https://landi-bg.com/images/file/kunifitoj.pdfIn PDF document text
    • http://consade.com/userfiles/file/18970591654.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/h67r0t7ndqh73n8e7ers1nd2h9/48662768708.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/hoeqqvlfvt15givoc52pa9rkc2/zakofukukeje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=coition+in+a+sentencePDF 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_off0000cddb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e5ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5ED 22816 bytes
SHA-256: 693c301edac82231ad5eafa3fbc330c233f4ac9a033adef740ca23a83501a994
font_02_sfnt_off000120b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120B8 10108 bytes
SHA-256: abe95b5a59bfa624000e3e35b0a073849af0dd4706df704f874f1f8ca1cc4521