Malicious PDF — malware analysis report

Static analysis result for SHA-256 4922a25df7d2690a…

MALICIOUS

PDF

85.3 KB Created: 2021-08-17 03:51:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1142995455012b1e70ab3bad24475163 SHA-1: 2be27eba2337ac7e33fcb081c62f064ae724c9a9 SHA-256: 4922a25df7d2690a3f9cc9b517a53c62eebb2cd303be453492ef63d21dcf0159
164 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many hosted on compromised CMS platforms or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the heuristic for a download button lure further support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://italvaping.com/file/65404820961.pdf In PDF document text
    • https://aymfly.com/aym_image/files/laromoxulimulitibi.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/gkf75g960viq0agvip3smk0tf7/86194657974.pdfIn PDF document text
    • http://banghaija.com/userfiles/file/51762429604.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bf9e940232c---wafevob.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/7f00g8u65ku85ctpa8n4f50nob/53882676506.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/s0d9bbcltg731fm87enpah5e85/bejorobusa.pdfIn PDF document text
    • http://jngf.cn/files/file/memamujapazufalakabug.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160e1d9ec09a41---siwosudofetagojud.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/1fg795d2v8vjpmbu6smtdgb3f4/finilupumita.pdfIn PDF document text
    • https://birudongker.com/contents//files/goferawekoninodefo.pdfIn PDF document text
    • http://piri-piri.pl/ckfinder/userfiles/files/soxebusowikitojo.pdfIn PDF document text
    • https://brmc.jp/user_data/userfiles/files/99218302788.pdfIn PDF document text
    • http://xn--80aafbanafwvcftiqfecrg2a.xn--p1ai/pict/file/25825861387.pdfIn PDF document text
    • http://labcoop-jsc.com/wp-content/plugins/super-forms/uploads/php/files/50e7pr6df3j6kgktlslbtegq5d/89490022966.pdfIn PDF document text
    • http://broorybulldogs.com/clients/33993/File/kawigapapusire.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e49c30d6d5f---75274771779.pdfIn PDF document text
    • https://aymfly.com/aym_image/files/35308109630.pdfIn PDF document text
    • http://shengyaweb.com/uploadfile/file/2021081523454848.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/d6b6efdda78867800eecad10983b3bb5/zipasaxipamujevikafuw.pdfIn PDF document text
    • http://chochosanencino.com/uploads/files/48849922278.pdfIn PDF document text
    • http://tpokebar.com/uploads/files/99794455419.pdfIn PDF document text
    • http://cba60.com/clients/6/6c/6c2dd71b6188bc8e8f5adc6209c6f86c/File/zosuzagimidosaparopewuz.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/68960092792.pdfIn PDF document text
    • http://skia22.ru/pic/file/26784564610.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/bukopipoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=download+clash+of+clans+builder+base+mod+apkPDF 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_off0000e764.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE764 17132 bytes
SHA-256: e3a6640b9219f9bb4f185c725d24ea6ec4fe349a995b50204714751a7778a1a4
font_01_sfnt_off00011435.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11435 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C4C 11204 bytes
SHA-256: 1905f5fc113516da9a7468751d1467ef254718b77cd70726fd4e68a47472f430