Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec705f6821fcc7c4…

MALICIOUS

PDF

69.0 KB Created: 2021-09-29 00:08:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d632599036512b1016aaaf987694ab0b SHA-1: 7fb0e74f6e165668e28d231f4618789dbbd63bea SHA-256: ec705f6821fcc7c45c6430e1a9bdb9863be3d56071d6b30c6328bac3000c73c4
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a tactic for distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://bogaarchitetti.it/userfiles/files/776878350.pdf In PDF document text
    • http://cncforginghammer.com/d/files/64072249781.pdfIn PDF document text
    • https://flyags.com/editorResources/file///50461811335.pdfIn PDF document text
    • https://transturist.ba/ckeditor/ckfinder/files/files/68615182728.pdfIn PDF document text
    • http://wellfoto.cz/pictures/files/vozifefir.pdfIn PDF document text
    • https://ymy-tea.tw/upload/files/ketipajuwetareg.pdfIn PDF document text
    • http://cadelupo.it/userfiles/files/88308379514.pdfIn PDF document text
    • https://ahha.az/userfiles/file/bugimozufonowafas.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16136e5fbcff04---vibetogafikiwukejadomu.pdfIn PDF document text
    • https://narellesastro.com/userfiles/files/36055369868.pdfIn PDF document text
    • http://ambiance-cinema.fr/wp-content/plugins/super-forms/uploads/php/files/5748492481338c6ad981f0a2c36be056/madavajovijo.pdfIn PDF document text
    • http://crmloccitanecr.com/campannas/file/16850070931.pdfIn PDF document text
    • https://natanashoes.com/kingkong/userfiles/files/ziluwakipogaviwemudir.pdfIn PDF document text
    • http://artpolyclinic.com/file/files/mafiwu.pdfIn PDF document text
    • http://jolanyee.com/upload/files/202109170151594019.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/161303e5bcb2a4---29300797099.pdfIn PDF document text
    • http://balmybnb.com/t/tutorfirm/uploads/ck/files/taletojisotetovupenuxew.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/41m613999lb7iaprbt4r7o0m4l/41997106335.pdfIn PDF document text
    • http://papaicountrylodge-longstay.com/user_img/files/65416178153.pdfIn PDF document text
    • http://location-appartement-venise.com/italie_documents/files/68174023670.pdfIn PDF document text
    • https://kontiko.com/ktkweb3/images/upload/files/lonofoxa.pdfIn PDF document text
    • http://bortran.com/upload/image/file/20210903073457.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=reading+comprehension+a2+open+questions+pdfPDF 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_off0000adc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c5d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5D4 15284 bytes
SHA-256: 93e810acafac3e99d20cf156106212edb579c67e0bfa1a60d04cd94ddbe1c5c2
font_02_sfnt_off0000ec28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC28 11432 bytes
SHA-256: 0690c861fb1573de046d519b81042ca1861e00149563bf8f943d13a4891a3e25