Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d948d315d0bc50b…

MALICIOUS

PDF

112.2 KB Created: 2021-06-29 20:59:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cf81842c0b9d48e323f73dd74dbea511 SHA-1: 1147126363a3bf19e2de60f9b4b04b3be73211c4 SHA-256: 3d948d315d0bc50ba8afb7570d8902e27ec49134ba47fe37cc82cac0222bb6fa
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing campaigns that rely on redirecting users through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/57ddfe83f9fe7504677e5dfe46382eb2/76188967477.pdf
    • http://maternites-catholiques.org/ressource/site-image/files/bajosogodibevab.pdf
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081e7e6290e6---zarapibaxekipem.pdf
    • http://accessprecision.com/userfiles/file/datewajepuzadowudotifunop.pdf
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160839e59170b2---rabaviginudepuxetapunixad.pdf
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c2d6719bd30---zufox.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607c88dfdd03f---42680312065.pdf
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160b48338d41ae---11822976593.pdf
    • https://bangprice.combangprice.com/beta/cms_image/file/rovopepajo.pdf
    • https://oxi-dental.ro/imagini_ws/jumizitinabogivelatod.pdf
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee3cc063cf---biwofotubaralawi.pdf
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/fa4f730234d13b7964eb847ff32804be/53449235678.pdf
    • http://baigeleather.com/userfiles/file/vidoxegit.pdf
    • http://massimomoroni.it/userfiles/files/77524215017.pdf
    • http://hotstamping.pl/files/file/95934416410.pdf
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf0218aa808---fezobuzenom.pdf
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/94cb708bb4d089d53725bdf865e753c7/80297826277.pdf
    • http://teechart.com/uploads/images/files/51312615712.pdf
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1609a09a512be9---vemitamisoriposobezajefaz.pdf
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097068885225---20402502449.pdf
    • http://sl1971.com/clients/5/51/517263f0417f9379c67e6eba0e0bdfe8/File/finukonefum.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=adjective+form+of+trouble
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001339a.bin
9a0fbff7af3a76adde83c2c8dcc5597f4058df1f888cc834c35a84e3327bf411
pdf-font-stream PDF embedded font (sfnt) at offset 0x1339A 10620 bytes
font_01_sfnt_off00014bd7.bin
d9deb4f6326cf01c541b0698d34e0490d9f4b5020101b532b3e6af8e28cdf304
pdf-font-stream PDF embedded font (sfnt) at offset 0x14BD7 16488 bytes
font_02_sfnt_off000162d7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x162D7 16792 bytes
font_03_sfnt_off00017ae9.bin
d2502acfe52b33ccdd6c0841c696cc3f42271322702f6653602fe44f6b900b99
pdf-font-stream PDF embedded font (sfnt) at offset 0x17AE9 20864 bytes