Malicious PDF — malware analysis report

Static analysis result for SHA-256 55986d00e2fa9649…

MALICIOUS

PDF

101.9 KB Created: 2021-08-22 00:47:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a378e738ce361e903af7c5e6a107be96 SHA-1: 9d18f804f9dd547a135a2fc2fc57f28372d15313 SHA-256: 55986d00e2fa96492d22a4ef12b7779c119cb2ddf3d83768a1fc89077c915088
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous external URIs and link farms pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to lure users to malicious sites. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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 http://quinta.cl/upload/files/xegozif.pdf In PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c61175692---rojomodoluxuna.pdfIn PDF document text
    • https://vibangnhadat.com/uploads/files/24366554247.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609d349158e67---89736614838.pdfIn PDF document text
    • http://mosjob.ru/images/file/59415941726.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/a3c822aedc433516c17a611c44a2c023/1782208310.pdfIn PDF document text
    • https://www.bakkersvlaanderen.be/resources/plugins/ckfinder/userfiles/0/files/39687685956.pdfIn PDF document text
    • http://rescue119.org/userfiles/file/42453479838.pdfIn PDF document text
    • https://istanbulbalbir.com/upload/ckfinder/files/tejulig.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160909926c7f2a---merozipunosirufuvima.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/160c3ce36a0360---99079281849.pdfIn PDF document text
    • https://people11people.gr/uploads/File/13941069574.pdfIn PDF document text
    • https://www.alugutader.fr/ckfinder/userfiles/files/wididutisife.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/19f4bf2c338c04e46c39af53a316b43e/povakaginewoteligawi.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f309a86e1---repeporijus.pdfIn PDF document text
    • http://michalpavlicek.com/uploaded/file/99619728691.pdfIn PDF document text
    • http://rencontres-icare.org/userfiles/file/febozotewiw.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bda2626cffa---nizemuxefumezaxanazo.pdfIn PDF document text
    • https://swalaya.in/userfiles/file/tidazabisivomiture.pdfIn PDF document text
    • https://www.bosingels.nl/ckfinder/userfiles/files/veram.pdfIn PDF document text
    • https://livnica-metalurg.com/images/pages/file/45009412996.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/f6b0c4a94105fa1a1f3ec26957c6bffa/pixej.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/jka0cb09ltjs3l8h1o600a3019/41638049568.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+fill+out+ecers+score+sheetPDF 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_off00012989.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12989 18620 bytes
SHA-256: 996344ed7d3653d2efc11a3423e29b605c49297bd5e4f379ce17cf0c2da18ac2
font_01_sfnt_off00015a97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A97 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000172ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x172AE 10344 bytes
SHA-256: f8bbb3f79088c8b16ae48494da1ab8ebf4a4c58285b7341a9b570aed611fe519

Open this report in the interactive analyzer, or submit your own file for analysis.