Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc482ad0ed0a2613…

MALICIOUS

PDF

70.6 KB Created: 2021-10-03 20:47:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: cb7e0905bc15e52db2366f1bd0a944c9 SHA-1: c34f7c00589c3df5d5f51930380676c2041f9757 SHA-256: dc482ad0ed0a2613d4951d689d52e3710294d2fc25ddfbcac1b05bc1a25ef932
96 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites. This suggests the document is being used as a link farm, likely to manipulate search engine rankings or to distribute malicious payloads. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1614adc4ed7229---82224813258.pdf In PDF document text
    • http://alexandersorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/47996915029.pdfIn PDF document text
    • http://brandorbit.in/userfiles/file/sopuweloteg.pdfIn PDF document text
    • http://xn--80aantfcaehjbxzf1m.xn--p1ai/userfiles/file/zunomat.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148647a8d821---814522236.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f871fd7d8b---mixowegobujoxegotovuxepax.pdfIn PDF document text
    • https://nestsearch.in/admin/uploads/file/90698758913.pdfIn PDF document text
    • http://taispacedesign.com/upload/files/sebifu.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/simutadoranififedigos.pdfIn PDF document text
    • http://phayaotechno.com/UserFiles/File/marajinakefaxugofilux.pdfIn PDF document text
    • http://joltiy.ru/uploads/files/37703306182.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/161506d6f1af6c---totuvurawabumo.pdfIn PDF document text
    • http://helderlive.nl/ckfinder/userfiles/files/larejafatuvixera.pdfIn PDF document text
    • https://takipcisec.com/calisma2/files/uploads/95737556646.pdfIn PDF document text
    • https://suncables.co/images/file/lijiwokamirimikijumi.pdfIn PDF document text
    • https://empresa-venta.hr/files/4701864038.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/lalililosokozobofa.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/kejoxifedim.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16138a31fd6775---80791542945.pdfIn PDF document text
    • http://szm.hu/userfiles/file/miragezoxi.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615615d6962ff---51237062384.pdfIn PDF document text
    • https://livres-arts.com/ckfinder/userfiles/files/folulewomuxoxuzok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=master+mods+for+minecraft+pe+addons+for+mcpe+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_off0000af10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF10 16816 bytes
SHA-256: bd164a286e1c3cd4cc54cee88f77e18d8c472ae22a780586bdb77d371518b669
font_01_sfnt_off0000d9d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f1ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1EF 10820 bytes
SHA-256: d2dfad8937b0228ae44c4ce31db61d837d95c8a781770fb4b6d54b52ec008970