Malicious PDF — malware analysis report

Static analysis result for SHA-256 01264a2f1da59677…

MALICIOUS

PDF

109.4 KB Created: 2021-10-13 12:52:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c3c1653ce95792d3d7f7a712ea6ba750 SHA-1: 65679c2b9c0a6678f7a37af40f31163c413cf63a SHA-256: 01264a2f1da5967779d092fbf8eb2346d257e3ef9cc99cfb765b97926c859b49
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the embedded URLs and the heuristic firings point towards a malicious document, potentially delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://dotacjedlaoze.pl/userfiles/file/50574953728.pdf In PDF document text
    • https://combrooncom.com/contents/files/soladopexudofuxetuledub.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/wijoxiwirere.pdfIn PDF document text
    • https://apc-algercentre.dz/ckfinder/userfiles/files/27191377592.pdfIn PDF document text
    • http://merwepizza.com/upload/file/lerodotazewepobalix.pdfIn PDF document text
    • https://ariaparvaz.com/basefile/ariaparvazcom/files/sizut.pdfIn PDF document text
    • https://riminabda.sk/userfiles/file/gabavifitixejo.pdfIn PDF document text
    • http://cosmikkino.ru/sadm_files/49208046231.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615c8971855ab---dominovolatejekixaregox.pdfIn PDF document text
    • http://mayinmaunhat.com/upload/files/wemewepixegi.pdfIn PDF document text
    • http://hijoin.hu/editor_up/59841362634.pdfIn PDF document text
    • http://www.kigimex.com.vn/ckfinder/userfiles/files/mabuzoweduderizag.pdfIn PDF document text
    • http://cermak-expo.cz/data/files/file/xobewonulanope.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/67f674a6cc9853cf5c5e82ff8395c233/rumowiwirivexi.pdfIn PDF document text
    • http://mrcookie.tw/upload/editor/file/121529192387.pdfIn PDF document text
    • https://drakbera.com/ckeditor/ckfinder/userfiles/files/govemazelisugewududoxuz.pdfIn PDF document text
    • http://gz-chengeng.com/uploadfile/files/jarebinezewegemotonuf.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614199a6ae683---22512825320.pdfIn PDF document text
    • http://stoka-saarlouis.de/userfiles/file/88187762105.pdfIn PDF document text
    • http://penzionriverside.cz/files/file/likivadegozerepi.pdfIn PDF document text
    • https://longhoang.vn/upload/files/befukuke.pdfIn PDF document text
    • http://fotografoenricogiampieri.it/userfiles/files/48618093864.pdfIn PDF document text
    • http://www.waetsukai.jp/system/ckfinder/userfiles/files/39986360098.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/D9plVHj2VOU/uplcv?utm_term=pisces+and+capricorn+relationship+2021PDF 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_off00013ed2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ED2 21268 bytes
SHA-256: 3052ebd12ea68c7a5049f5f6729107c9a94b52f00c6afc36a232503e207b7368
font_01_sfnt_off00017679.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17679 10904 bytes
SHA-256: c442a22981d791423c8ad4b384801eaa7292a5e2eda5ef45b10f07b5f4a491d7
font_02_sfnt_off00018fb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18FB1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1