Malicious PDF — malware analysis report

Static analysis result for SHA-256 25d682cf26067301…

MALICIOUS

PDF

71.1 KB Created: 2021-09-20 04:30:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d7b1bd1e6d4729b622876d459ff09369 SHA-1: 84433885322f8fd1e63359c4ccb64106e10715a0 SHA-256: 25d682cf2606730146908cbb2c3d4fbd2414d0374e5a3fe5edcfb8266cffe25d
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to external PDF files, many hosted on compromised CMS uploads. The ML classifier strongly indicated maliciousness. The presence of a 'link farm' heuristic suggests the document's primary purpose is to redirect users to these external resources, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://smidgel.ru/uplcv?utm_term=compose+email+gmail+android
    • https://jmcoverseaspvtltd.com/uploads/files/29255761696.pdf
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/geramunanavibe.pdf
    • https://ijfbacknumber.com/editor_up/mufojafa.pdf
    • https://cleanenergy.mn/uploads/files/50550462365.pdf
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/f9d1a2249fbfcbbfe40d246bb05d2966/kulalem.pdf
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135eb8662c40---84031016310.pdf
    • https://bdata.vn/upload/files/zatubosazabijorut.pdf
    • https://autotoner123.com/home/autotone/public_html/ckeditortest_WORKING/ckfinder/userfiles/files/vefubupubagulakatofikota.pdf
    • https://tomorrowhubs.com/upload/users/files/muwovuzinuvoge.pdf
    • http://zaun-produzent.de/userfiles/file/dafetemalukuwowugifane.pdf
    • https://advance-pack.com/editor_upload/file/rodarosotoxi.pdf
    • http://sualpturizm.com/userfiles/file/zukadimudidovitetuzadubub.pdf
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/161402e9d5fe35---kisanidex.pdf
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/fdi5kl1empnvsslc7k4dbafso0/vojesozudepavu.pdf
    • https://gsm.company/ckfinder/userfiles/files/wivome.pdf
    • http://huzatfokozo.hu/editor_up/36467939825.pdf
    • http://mxagproducts.com/upload/browse/file/zafejeririjubenogatuwige.pdf
    • http://tnshoppingbag.com/upfiles/file/24600808007.pdf
    • http://kzlo.pl/fotki/fotki/file/konufatasobititinamad.pdf
    • http://keacg.com/upload/files/vozumuvakolibavezenam.pdf
    • http://konberdbio.com/upload/files/xefinusosulo.pdf
    • https://www.auto-ecole-acm.com/ckfinder/userfiles/files/81300404413.pdf
    • https://n-v-v.dk/userfiles/file/kexejewow.pdf
    • http://paradisetourkorea.com/FileData/ckfinder/files/20210914_E80F82DF54BE1B5F.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b5a2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB5A2 16792 bytes
font_01_sfnt_off0000cdb9.bin
cf94c9e1de12ea3f105c53d4490f363d7dd22e3827a10aaecc58c86ea0598a0f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCDB9 10668 bytes
font_02_sfnt_off0000e5de.bin
13ec69260bcd6283d7cd3690b8c5e5783d5b8d584c6a7a68b3bf618c7fca1566		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5DE 15928 bytes

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