Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f7f65d0629e9cb0…

MALICIOUS

PDF

86.1 KB Created: 2021-07-06 05:31:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 05e013911e51be333b38ca626c89b25e SHA-1: 8f70d9d4529016e140a81c83e58393a8033e1cb3 SHA-256: 7f7f65d0629e9cb0827e92a251072bfd17dd8723b73a869d805d3ab1440810a5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised websites, indicating a link farm or phishing lure. The presence of external URIs and the detection of a 'Phishing.Trojan' by ClamAV suggest the document is intended to redirect users to malicious content. No scripts were extracted, but the PDF structure itself is leveraged for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://synerhu.ru/uplcv?utm_term=how+many+ounces+in+a+us+gallon PDF link annotation
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/05b9f53ffd194d9b68f1a531244a6ac2/rogeni.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/sagivilolexuzepemiwiderof.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/rosuzuziwimesapu.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1608fc258e6696---fewigepuwuputotudufuxu.pdfIn PDF document text
    • https://eventaipei.com/upload/files/30851873673.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160718cbb02725---55980853070.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16091f8f4d787c---20811093996.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160758ecca5e8f---dejukejepari.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/3c11115547543f631ef077cf423f3130/bedux.pdfIn PDF document text
    • http://whsclass1968.com/clients/f/f8/f849445bb2fb8f42e7c863050dc1ba38/File/zurejugatunoxemipexamok.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/hcks3r0vf6sfbqt5du7rfscuk2/xawapikonipafezofokapefex.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/8q27o22cl2pod2c9042pd197a2/torotebesaf.pdfIn PDF document text
    • http://hoangle.vn/uploads/userfiles/file/mugufiraniboriretemo.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/d4120c41bfac3af2f4dd62983225b9a0/27173219259.pdfIn PDF document text
    • http://elite-nails.pl/Upload/file/fujomesadamalupanu.pdfIn PDF document text
    • http://thebrownsfamilyreunion2008.com/clients/81208/File/72379152362.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/53290118544.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/b12198534a2445e84e58fe4ce2a52827/widojix.pdfIn PDF document text
    • https://isleo.com/i_photos/file/xoguzojisanobepe.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/33e9db5b0909764d09d3b52f68f8ae3c/67410945904.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/44b7695ad491280fc3d29bb007b8c979/82297623126.pdfIn PDF document text
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/renomunuje.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160870018d0206---viwolorafafufozab.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160725e7bc4b8a---tuxefekonojamuravojokal.pdfIn PDF document text
    • 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_off0000eff0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF0 16488 bytes
SHA-256: a6c6f3b6a710e1d9b25b2d42e706328f31a96573fc80580657ec8d60e1c7b9f7
font_01_sfnt_off00011a9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A9F 10668 bytes
SHA-256: c5b0970019a6f0f7d9a33741e1a93a29f80e9173559412faf9419609ba9bcb5c
font_02_sfnt_off00013317.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13317 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1