Malicious PDF — malware analysis report

Static analysis result for SHA-256 732bd73fa05d6af7…

MALICIOUS

PDF

85.4 KB Created: 2021-07-09 13:23:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 16c6f53379f4221ead9615cf31c4283b SHA-1: d70b86eddb23f215ebb05ac81c57501d360bb4c8 SHA-256: 732bd73fa05d6af723ba074ead96db58062f69b3c351f6cd21cc0416d714f658
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as a link farm. The ClamAV detection and ML classifier strongly indicate maliciousness, likely related to phishing or malware distribution. The presence of multiple distinct hosts and the use of 'utm_term' parameters suggest an attempt to obscure the final destination and potentially track user engagement with the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/9206aa3aff0f126d43418a15b2b47705/42485461657.pdf In PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/fd950c130645fe56fd5366d528cc7493/78326763795.pdfIn PDF document text
    • http://mega.kz/media/upload/files/88002346939.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/8eed6e6aa7a372098414debbe1301e90/92159761174.pdfIn PDF document text
    • https://rajaunited.com/contents//files/77478459616.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a30618a4fda---kitozewu.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160893ffa52582---53081277286.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0aea4a9168---21244860464.pdfIn PDF document text
    • https://clinicscrm.com/img/files/93771164079.pdfIn PDF document text
    • http://mamam.by/upload/File/file/tipetotuvubutibotamepe.pdfIn PDF document text
    • https://osikovo.eu/webroot/img/content/files/33368865722.pdfIn PDF document text
    • http://lucann.com/Upload/file/pirifim.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/n5bfjirdfn7q4rsrqkhmsl7ksb/27982212699.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/427d526cbb6e229b79b17dbe5e5827b0/tavimavozitifadesalofemo.pdfIn PDF document text
    • http://ajisushionline.com/uploads/files/28579096533.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/b8e4debec55adac3ec527f96e4d225a7/vowasabo.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/taroruni.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/16082faf12cecf---15316840304.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/d578baabc38a68ee1182f3071a4ba75b/xipujugifijotakes.pdfIn PDF document text
    • http://cjatkinson.com/userimages/xinobizajatolubo.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16085344e5b918---gakovuwupoterisaguxi.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d86b2c8f6---telekufomudirinumaku.pdfIn PDF document text
    • https://penal-garazh.ru/files/14524437592.pdfIn PDF document text
    • https://willmarlakesarea2040.com/ckfinder/userfiles/files/kubexedudibirawono.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081c4dd8e8b5---92215962620.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088db53c3e93---gazabevakefomutugo.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/89424605513.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=right+hip+fracturePDF 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_off0000ed55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001056c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1056C 10468 bytes
SHA-256: 8b98ea26836ce23dcd99ccf470f7ec0056dd038cb42a2268f1d5ed57e1c48f12
font_02_sfnt_off00011d59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D59 16584 bytes
SHA-256: 88104f8fbb7d678a9b9ab822bc9092dce7556e5e03ee37db1f0464ef7eda3ae0