Malicious PDF — malware analysis report

Static analysis result for SHA-256 e69237c1c4106696…

MALICIOUS

PDF

82.9 KB Created: 2021-09-20 09:16:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9e64bc095308d2cc1d235d74fcf6efc8 SHA-1: 30490f297fcaf6a9b823508c21094c47bce6e914 SHA-256: e69237c1c4106696cf8141ba1699929f070e03f060bdeacc30b64e73d0eb3287
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of numerous external links, some pointing to compromised CMS upload directories, suggests a phishing or malware distribution attempt. The ML classifier also indicated a high probability of maliciousness. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a malicious workflow, likely involving the download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9373

Heuristics 7

  • 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.
  • 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://nomylo.ru/uplcv?utm_term=tubemate+335+download PDF link annotation
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147d9210900a---79790708478.pdfIn PDF document text
    • https://alcoquimicos.com/ckfinder/userfiles/files/zepowewonexujijapagini.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613e59ed31686---49650115419.pdfIn PDF document text
    • http://kinel-hunter.ru/upfiles/file/vivoxuxabodubej.pdfIn PDF document text
    • http://spadhotel.com/basefile/spadhotelcom/files/rapazegukewijaturo.pdfIn PDF document text
    • http://osayit.com/images/file/97242747673.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/93841269425.pdfIn PDF document text
    • https://myphambambi.com/webroot/img/files/belidotaneruwinuragit.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/8d4ba1068829e00c061767db738cff45/dimipevuwuzav.pdfIn PDF document text
    • https://dailyiat.com/html_upload/file/rabisa.pdfIn PDF document text
    • http://clinicaveterinariamontecchia.com/userfiles/files/76707799164.pdfIn PDF document text
    • http://devison-matras.com/upload/file/linogu.pdfIn PDF document text
    • http://peterpan1996.it/userfiles/files/68262270949.pdfIn PDF document text
    • https://martas.vodrsport.cz/uploads/files/nowaloboraxunigib.pdfIn PDF document text
    • https://heritran.vn/uploads/news_file/81916933396.pdfIn PDF document text
    • https://eravukappalpalli.com/userfiles/file/wexalutububosen.pdfIn PDF document text
    • https://apotekatia.ba/fajlovi/muberop.pdfIn PDF document text
    • http://kompassztuki.pl/Image/files/koderirupexone.pdfIn PDF document text
    • http://piri-piri.pl/ckfinder/userfiles/files/mobidabutufusov.pdfIn PDF document text
    • http://hwayoung.kr/upfile/files/67182682263.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/c3b604netp5v2m44t8misptr44/62496567425.pdfIn PDF document text
    • http://theclubburger.com/uploads/files/robugaruli.pdfIn 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_off0000df99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF99 20544 bytes
SHA-256: 88ec3721264deac524475afc68614620e46d901c7c87445859201049f06dc8e9
font_01_sfnt_off0001151e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1151E 10644 bytes
SHA-256: bfe45a5c4b4b5ad7bbf824cdd7208a27176d8ccb8117f24e78a59c8062732ba1
font_02_sfnt_off00012d93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1