Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e3dfd1ac562df5d…

MALICIOUS

PDF

81.1 KB Created: 2021-09-14 13:31:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 288c2c92f0df39360de5f401e768d2fe SHA-1: 9311c29b7506f653b9472b138b0e97d4ee9531e4 SHA-256: 1e3dfd1ac562df5d5e0b02b542a12f471cb65a0981d7a17c3b7e4ebaf3380c02
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs that point to various domains, many of which are identified as link farms on disposable or compromised hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. The document body is heavily obfuscated and does not provide direct textual clues, but the overall structure and heuristic firings point to a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://smepil.com/ckeditor/userfiles/files/baxujebanomoweru.pdf In PDF document text
    • http://seibyou-koujien.com/files/files/80142319936.pdfIn PDF document text
    • https://ever-progress.com/upload/files/rejununepulesu.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/64300036179.pdfIn PDF document text
    • http://wsm.hk/images/uploadfiles/file/66822190208.pdfIn PDF document text
    • http://kemmurad.com/webroot/img/files/97371622977.pdfIn PDF document text
    • http://xn--knstlerische-biografie-arbeit-lbd.ch/userfiles/files/74812501220.pdfIn PDF document text
    • http://xn----dtbsgbucafmmaf.xn--p1ai/servimages/editor/files/dalanajopelek.pdfIn PDF document text
    • http://worldtile.net/jangheung/userfiles/file/97866088653.pdfIn PDF document text
    • https://littleitalypizzany.com/nbloom/fckuploads/file/6939227375.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/dexisizigi.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/026359682b8660d424aa0459df9dca49/49289905700.pdfIn PDF document text
    • https://zenithoverseas.com/assets/userfiles/files/11485866639.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/49665344317.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e59e46bd0e---buruziwanitogozezaginuka.pdfIn PDF document text
    • http://jump360.co/upload/files/20210908083705.pdfIn PDF document text
    • http://naphogacomposite.com/upload/files/winevolegusejalubokuz.pdfIn PDF document text
    • http://sibstroiexp.ru/userfiles/file/62166695765.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/647ccd635c39454a942ee6707ef4cc76/76519388360.pdfIn PDF document text
    • http://unite-chem.cn/upload/files/13585480188.pdfIn PDF document text
    • https://malayalamfoundation.org/admin/my_files/file/rukizekomukeki.pdfIn PDF document text
    • https://ymvii.com/admin/upload/files/81235481415.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=phone+cleaning+apps+that+workPDF 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_off0000d73e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD73E 18032 bytes
SHA-256: 83396dd4fcad32079929efa5e8092083b480af71f4f8ab3b2498494b14577f72
font_01_sfnt_off0001063f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1063F 10832 bytes
SHA-256: 29f1ea8f120574aed7941dedeb4131f2373e5a5e587b9ba3056c6e5dbe43c75c
font_02_sfnt_off00011f47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1