Malicious PDF — malware analysis report

Static analysis result for SHA-256 a766a711ca9ac344…

MALICIOUS

PDF

88.9 KB Created: 2021-08-19 20:51:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 4380d6ca7c5d5daee3827f3176eb231f SHA-1: 2e3a7b71f28ef83cbbde637a98a264f533ceeea4 SHA-256: a766a711ca9ac3441f1fa64ef814973d10adb5a41272ddebfa845bc8e6a88f88
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many of which point to compromised WordPress upload directories. This suggests the document is designed to act as a link farm, potentially for SEO manipulation or to distribute further malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9764

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 http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dfa6277dbbb---tuganogisuvodilutito.pdf In PDF document text
    • http://compufoxmail.com/userfiles/file/59023044163.pdfIn PDF document text
    • https://eravukappalpalli.com/userfiles/file/tixatavujakumutevipuba.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/31792508159.pdfIn PDF document text
    • http://dotacjedlaoze.pl/userfiles/file/47269218431.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/1c9fd7c327cca197d8243cb61345a01e/44458337335.pdfIn PDF document text
    • https://virtualpulse.eu/UserFiles/file/ramorugofomub.pdfIn PDF document text
    • https://cmoretv.com/userfiles/vakaron.pdfIn PDF document text
    • https://www.saammohaseb.ir/wp-content/plugins/super-forms/uploads/php/files/904605d6456389d5e579f917867a553c/82722512446.pdfIn PDF document text
    • http://sushiyaslo.com/uploads/files/faliw.pdfIn PDF document text
    • https://atasuorganiktarim.com/upload/ckfinder/files/6332234484.pdfIn PDF document text
    • http://lawyermo.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/78675596945.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/pujof.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f2702d1f9a1---vixadafewobujezomopapurez.pdfIn PDF document text
    • https://ctapigroup3.com/contents//files/84327415488.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607c740b68a74---nudabatitigofipojefo.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608440bf526e0---bewaza.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa40599aef4---5197654045.pdfIn PDF document text
    • http://dsrental.com/userData/board/file/bisagirabuxovalumu.pdfIn PDF document text
    • http://happypalettebnb.com/CKEdit/upload/files/vodibonog.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/6034843957.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acc1a398981---melulez.pdfIn PDF document text
    • https://smilaxlabs.com/userfiles/files/29976067306.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/89010025376.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/41610584690.pdfIn PDF document text
    • https://soechi.com/userfiles/file/36805855224.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=neelakasham+pachakadal+chuvanna+bhoomi+movie+download+isaiminiPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA5 16060 bytes
SHA-256: 8bfc5e2f6383778b4716e60c732a7e5228106b692ca52c1f6b3c0b2892049825
font_01_sfnt_off0000f4b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B4 16888 bytes
SHA-256: 5df3f389d8fca7bd8dae576fb12522af558c71b36778f8260c3cb44e3eeab4b6
font_02_sfnt_off0001211c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1211C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013933.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13933 11044 bytes
SHA-256: 9ebbd986a866aa371bec2112c96623216338be073e8c2b73cd751e4f0d084292