Malicious PDF — malware analysis report

Static analysis result for SHA-256 61d232a897397459…

MALICIOUS

PDF

111.4 KB Created: 2021-09-03 06:53:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a29f27859be43646643c6761db06d1be SHA-1: 87e987c7049a173c1aea8db5234cb105b84aa384 SHA-256: 61d232a8973974598912c8d2f9e21bd562065bc5eb4d2d32f1b940c3be13aeb8
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external URIs and links pointing to compromised CMS uploads and disposable hosting, indicating a link farm. The ML classifier strongly flagged this PDF as malicious. The primary purpose appears to be directing users to external sites, potentially for further exploitation or malicious content delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 5

  • 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 https://infrive.ru/uplcv?utm_term=barisan+nasional+manifesto+pdf PDF link annotation
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f676cc7e0f2---38483846392.pdfIn PDF document text
    • https://psihodesk.ro/ckfinder/userfiles/files/faxupalejuros.pdfIn PDF document text
    • http://ranjitabiswas.com/userfiles/files/5382268386.pdfIn PDF document text
    • https://bacninhonline.com/webroot/img/files/nejubi.pdfIn PDF document text
    • http://prabashproperties.com/ckfinder/userfiles/files/tibobaf.pdfIn PDF document text
    • http://akademibt.com/resimler/files/saputosodurujap.pdfIn PDF document text
    • https://sevenhillsgroup.net/ckfinder/userfiles/files/5330400618.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/ef952aabe104ce4c4433a1036a2a7409/powisatukozuf.pdfIn PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/41560832395.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/20216308919034.pdfIn PDF document text
    • http://brette-animation.com/userfiles/file/91728998055.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab8a9015120---2433934937.pdfIn PDF document text
    • http://angelofthewinds.org/ckfinder/userfiles/files/zatopotebono.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16113ded97b571---55641736053.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073e8d58dae3---36903468183.pdfIn PDF document text
    • https://peoplesmodelinternational.com/ckfinder/userfiles/files/lesavulotasenif.pdfIn PDF document text
    • http://win-sonic.com/kida2018/ck_imgs/files/17016193614.pdfIn PDF document text
    • http://computergramm.com/userfiles/file/lupajir.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7405eeb75---22151152083.pdfIn PDF document text
    • http://snypes.nl/img/customer//files/tomiwigapuvodesis.pdfIn PDF document text
    • http://asupuro.com/upload/save_image/files/puzuwebitirowava.pdfIn PDF document text
    • https://wisserarm.nl/app/webroot/files/userfiles/files/bujaw.pdfIn PDF document text
    • https://delphin-restaurant.com/ckfinder/upload/files/vagiv.pdfIn PDF document text
    • http://szyoujin.com/UploadFile/file/20210823192617647.pdfIn PDF document text
    • https://couvreur-hautdoubs.fr/internet_new/images_et_fichiers//file/1775772254.pdfIn PDF document text
    • 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_off00014589.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14589 10712 bytes
SHA-256: 0cd5740d38cd6d85bdfd2777cc79942f4c117184940e3e7142e776f68a193044
font_01_sfnt_off00015e17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017629.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17629 21636 bytes
SHA-256: f2c2fe7f0b0994ad09366e4a6e4340429d9f12c8b16349f0a3e476cc5ed5a0a7