Malicious PDF — malware analysis report

Static analysis result for SHA-256 9acb170e2b8b9687…

MALICIOUS

PDF

83.8 KB Created: 2021-09-17 12:01:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cd3f514d7262187b9405b20f3bc0d13a SHA-1: 48be0b4bc66f4edfe78529a2ff3d6652c18ae834 SHA-256: 9acb170e2b8b968728122d4725c492faf728772e0920cab14f23d6adcda360b9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with numerous URLs pointing to potentially compromised websites and disposable hosting, suggesting an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://studiotecnicoforace.eu/userfiles/files/fewevidanogesisewonilizir.pdf In PDF document text
    • http://e-pisanie-prac.pl/famprojekt_z_serwera/images/file/xupuguwowijero.pdfIn PDF document text
    • http://spy-military-labs.com/userfiles/file/sofowuguvisetarixate.pdfIn PDF document text
    • https://egokituz.org/files/galeria/files/bimoteguposom.pdfIn PDF document text
    • http://litroshaber.net/resimler/files/76105187952.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/7244819187.pdfIn PDF document text
    • http://offerparts.com/upload/files/zonusokanadodaj.pdfIn PDF document text
    • http://focalthai.com/file_media/file_image/file/zovujubimebogenosuso.pdfIn PDF document text
    • https://lomasdelaweb.com/userfiles/2008.09/file/vagetixisomurub.pdfIn PDF document text
    • http://belstroyiz.ru/img/file/85609851804.pdfIn PDF document text
    • http://avatars.ru/userfiles/file/18265213872.pdfIn PDF document text
    • http://twfbs.com/ckfinder/userfiles/files/15335882568.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/161308809f0bf8---varabalomabivo.pdfIn PDF document text
    • https://koetec.com/home/~ptow/public_html/ckfinder/userfiles/files/21582344946.pdfIn PDF document text
    • http://carbonelite.ru/file/zuravexovopeputupus.pdfIn PDF document text
    • https://best-label.com/upload/files/69081831258.pdfIn PDF document text
    • https://www.pension-chevaux-haras-gabereau.fr/ckfinder/userfiles/files/21658655072.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135f588d7746---30895764067.pdfIn PDF document text
    • http://volkshilfe-ktn.at/images/content/files/90727753144.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/67fceb5a15f420c24d51b373cb438a7f/30180527937.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/66ii947fn1p77dbqstmohlgl9l/rezel.pdfIn PDF document text
    • http://kolesnikov.pro/ckfinder/userfiles/files/9600634541.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16138dc6d2911e---kuwokinufutaxowuzisazag.pdfIn PDF document text
    • http://dajuicebarus.com/uploads/files/gotofizuzazipemul.pdfIn PDF document text
    • https://groupburuemas2.com/contents/files/lekejodexabukapujeta.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=cara+mengganti+email+baru+di+hp+androidPDF 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_off0000e66f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE66F 10944 bytes
SHA-256: cf205fd1d0adaa8ba0eb0c0946b3200f392a2be0a60f53222049fca99209ad18
font_01_sfnt_off0000ff1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001172f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1172F 16328 bytes
SHA-256: 3bc6066546817703e6e1abf3c8d5a6a175cdc46bcf3a896cd8f45b1620fdd76c