Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8418672c7da9b46…

MALICIOUS

PDF

81.9 KB Created: 2021-09-02 08:27:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 04f6366bf0ded79fef00c77908aea3bd SHA-1: 32edc967cf2336292a84b1d489b6aea5ea1a1def SHA-256: a8418672c7da9b463fda6885a78ca6f614712b5accb9e118835d1cdae3a0d870
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, directing users to multiple compromised WordPress sites. The presence of numerous links on disposable hosting and the use of UTM parameters suggest a phishing or scam attempt to drive traffic to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160e5201603e8c---79201079725.pdf
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8a9f099f2---sizenikovuxi.pdf
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/765dad5c33fdf268dd1f79c2bb549cef/jagixenudapale.pdf
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/eigktuj1i57376g0jk315hk5i1/68997478257.pdf
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/754f4b0a747ae5654a325ae0bc97f36c/bazujafodigikudejis.pdf
    • http://www.pilartangguh.com/file/20582400932.pdf
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf738115d2---loforulepivumixu.pdf
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abe74dc8ac9---58931090570.pdf
    • http://galluccifaibano.com/userfiles/file/57115177796.pdf
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160a118bb12e16---gevepubavukuvopovegi.pdf
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/to05fqudk99r6o6dvdftm72kfd/84991451956.pdf
    • https://topclassgreenery.nl/images/file/74534277050.pdf
    • http://www.monts.sk/upload_images/file/pitodikol.pdf
    • http://ladue69.com/clients/876446/File/55278575736.pdf
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/02q7hdadjhuurl0rk2t6dbplbn/26357044940.pdf
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/m8e8fn38388qvtpka3t9jcu8s2/paful.pdf
    • http://industriefotografie.ch/userfiles/files/xemavada.pdf
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/sv3v9f8pq2ibldm44fi8p0cdn3/88716571714.pdf
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092a9a1de262---wirire.pdf
    • http://mp-journal.com/media/file/xativebedufisitulo.pdf
    • https://burkina-businessschool.com/business_school/uploads/file/bujitomifafadase.pdf
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a7748d480d9---593698250.pdf
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/d6bd39d0d264d72eb1b547adb021e473/tinifekazexini.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=man+united+insults
    • 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_off0000debe.bin
db48061c22b42cfd561d01969d7748b7e238011ade872c1430c5d4f6950e3218
pdf-font-stream PDF embedded font (sfnt) at offset 0xDEBE 10116 bytes
font_01_sfnt_off0000f56b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF56B 16792 bytes
font_02_sfnt_off00010d7d.bin
97ba33f35c49367588fb6077f102055a1c3d520d242723766708d6bbd1fbc491
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D7D 17692 bytes