Malicious PDF — malware analysis report

Static analysis result for SHA-256 5deff45fbdd5a670…

MALICIOUS

PDF

98.2 KB Created: 2021-07-31 07:01:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f92bc69f413bf5b3797069b867a7cf24 SHA-1: 98534255ca267e1969c2640f464a3389a2fc8b0b SHA-256: 5deff45fbdd5a67015ee833c3713b917718cacbfa0f6ed3b9a1be3d219c02942
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting an attempt to distribute further malicious content. The presence of a 'download' button lure reinforces the social engineering aspect of the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/f77177606c04cc7651668a8206766bf3/21143086415.pdf In PDF document text
    • http://danieldesignpro.com/userfiles/66930527825.pdfIn PDF document text
    • https://kermiradiatoriai.lt/images/files/97159506853.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/c8d77b886ce1cdd5524b288ffb60460b/72180539917.pdfIn PDF document text
    • https://abcoegypt.com/userfiles/files/xojamovopoxonisi.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/qf0no1pni2bpn44qo3c8vnl6r4/xawusogufapopelevotuva.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0ff3533be---31673517414.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/rasizatixofaw.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b39200b6042---tasuximulotugutos.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c31782746e7---52118133774.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160fd2c0e866c3---21803467496.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/3rkq7p7jnddcgh7ajbmbi71g0t/60985725969.pdfIn PDF document text
    • http://martom24.pl/martom/userfiles/file/29576634235.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/49565469874.pdfIn PDF document text
    • http://bobiniauto.com/userfiles/file/62924136329.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a15b6ac3a02---mudis.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df5663cb9f9---somesikalugudawobajobodej.pdfIn PDF document text
    • http://melly-incendie.fr/img_db/44398853162.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6b7c1cc3d---22350587682.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/2840a9aad8298952ddb6fbbe823aaf59/xutubowuk.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/25154031644.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/3evblcmj6al75fms4upug1mspn/tigonedo.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a2e96eaa35---76393603460.pdfIn PDF document text
    • http://seamacros.com/upload/file/semuwaresu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=download+super+mario+maker+mod+apkPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/9e1e3e4b0dc4506c0f89f4606d378c0d/nuwututevelup.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_off00011828.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11828 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001303a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1303A 18444 bytes
SHA-256: c98132e12c554b19e9e76415cc065eb44610623ac09db4f5ffb99d9f092c001b
font_02_sfnt_off000161b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x161B7 10732 bytes
SHA-256: a7f39b01d03c3245dc89d48296fc1fc823e3e8cf86bb633dc8ea1a94d3a90b43