Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff20eee578106055…

MALICIOUS

PDF

97.7 KB Created: 2021-09-16 03:58:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c018c00b1f741bd6be6192d787b1d0de SHA-1: 0b271b1815f44ebda93e8b6eea307fa38c3bfa8b SHA-256: ff20eee5781060556a948c6aa6e2af7a57316b4f74a5b3d676d90cae8f979947
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or redirection to malicious content. The primary function appears to be directing users to external, potentially harmful, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://elencostruzioni.it/userfiles/files/64357262448.pdf In PDF document text
    • http://selfmadefilms.nl/userfiles/files/3639789765.pdfIn PDF document text
    • http://sql110.com/pic/61800261323.pdfIn PDF document text
    • http://rybarict.cz/webpagebuilder/ckfinder/userfiles/files/90475962801.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/pogajifodakanefega.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/d744aba955bfbee8ab7a3b50f8151725/ragowetufurakedox.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/suwilisuz.pdfIn PDF document text
    • http://alltimescare.com/attachment/files/51373579623.pdfIn PDF document text
    • http://njuhome.pl/ckfinder/userfiles/files/71385017589.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/82129333479.pdfIn PDF document text
    • http://hiroi-es.info/yamituki-n/uploads/files/wutob.pdfIn PDF document text
    • http://congseng.com/uploadfile/files/4641106784.pdfIn PDF document text
    • https://novamakine.com/upload/ckfinder/files/xedefawofiladedeparaziw.pdfIn PDF document text
    • http://sofar-france.com/userfiles/file/28824876822.pdfIn PDF document text
    • http://sql110.com/pic/zutikonaki.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/7303f16d0e44e602bc51c57c61e68185/67920936575.pdfIn PDF document text
    • http://novo-foto.ru/ckfinder/userfiles/files/wazoda.pdfIn PDF document text
    • https://sabunwangi.com/contents/files/9290591510.pdfIn PDF document text
    • http://ccshecea.org/upload/files/bozilofojaruta.pdfIn PDF document text
    • http://zavalinka.by/var/upload/file/38087504504.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/2e0bf41f575a7eb66363b51eac6290ce/58117098106.pdfIn PDF document text
    • http://salman-is.com/userfiles/file/suralifepobizedawo.pdfIn PDF document text
    • http://qianlong99.org/ckfinder/userfiles/files/berizozelezemufedov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=chal+mera+putt+2+online+watch+hdPDF 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_off00011501.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11501 19444 bytes
SHA-256: 84356bd15bba015f03b298c7bc8610e6bbc078448a406cd8e74d2e94a825b446
font_01_sfnt_off000147c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015fd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FD8 10948 bytes
SHA-256: 0c78325c0e8e49d6757fe723ce5ebd150a23aa6a7ccba6e41ea5326d7cd95189