Malicious PDF — malware analysis report

Static analysis result for SHA-256 aecba7f6e60c95b3…

MALICIOUS

PDF

91.6 KB Created: 2021-09-20 04:14:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c15303c2ef8804572b3ff9011ae9e8c7 SHA-1: b6954230c8ffe93c82aa2d113041da5beb55c20b SHA-256: aecba7f6e60c95b36c9a62b09f3ab5de34ae57aa874960f62454215e83de44fa
164 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a PDF link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a spearphishing attachment used to deliver further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16141174f9e9a1---gesujakegokezitiwemij.pdf In PDF document text
    • http://cupta.org/userfiles/files/20210907084804.pdfIn PDF document text
    • https://crownprolaw.com/userfiles/Proj_Name/files/lixawulewe.pdfIn PDF document text
    • http://lumieye.com/userData/ebizro_board/file/biduloxozejutiwi.pdfIn PDF document text
    • http://desiaussies.com/ckeditor/uploads/files/20780427492.pdfIn PDF document text
    • http://domgr11.ru/uploads/files/marefibiwirodowotadot.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161416d600bf9e---sewobinujezafafijidupo.pdfIn PDF document text
    • http://e-hematologica.pl/users/file/tixegef.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/losorebuviwiderepule.pdfIn PDF document text
    • http://noclegsosnowiec.pl/eurostyl/photos/file/xefojikofepepiparan.pdfIn PDF document text
    • https://binarbaidtrading.com/public_html/userfiles/file/16500557988.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/bd0fbcb730f88058a00fcf5dba6e903c/zapelufovozegiravad.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613065ddc5647---vemujagotejujuzi.pdfIn PDF document text
    • https://el-tall.pl/pics/file/51890814307.pdfIn PDF document text
    • https://ichibaninfotech.com/ckfinder/userfiles/files/gizukobunizerixowabika.pdfIn PDF document text
    • https://studyhalltracker.com/files/file/46594424193.pdfIn PDF document text
    • https://xehowo24h.com/images/ckeditor/files/kogorufagetavugegibe.pdfIn PDF document text
    • http://mindatpeace.us/uploads/files/pojiwe.pdfIn PDF document text
    • http://ossokahve.com/upload/file/batibuvigadazuweseful.pdfIn PDF document text
    • http://sherwoodchambergolf.org/ckfinder/userfiles/files/16297777984.pdfIn PDF document text
    • http://culbertsonlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/88267305827.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/lesewipugirudimesuvo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=download+pubg+apk+no+dataPDF 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_off000102ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011ac5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AC5 10492 bytes
SHA-256: 76f8e68570012803a6cae07916d9bac015f3525dbe278cb601acdfc98e30f0a1
font_02_sfnt_off00013251.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13251 18020 bytes
SHA-256: aed83652f1c6dd0f10a9d5a94c979b6b112b3051a5f9e0337fc142ed15550a9c

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