Malicious PDF — malware analysis report

Static analysis result for SHA-256 915fd140144b61ee…

MALICIOUS

PDF

94.0 KB Created: 2021-07-20 00:42:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: a6227242db3e823ee10c38c7e15fb6a8 SHA-1: c66d6792c6ce114e854f5aef9136a28048660d5f SHA-256: 915fd140144b61ee3f24a3654f0d4e25b8124e1aa681dbd4c7f54a545faee822
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting sites. The presence of numerous external URIs and link farm indicators suggests the primary goal is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607c53b2b66ce---51795312090.pdf In PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/idcpc3g96i8ssqqmek8q2gh5c0/jozanowoziginerozoxim.pdfIn PDF document text
    • http://gekon.net/userfiles/file/33329307576.pdfIn PDF document text
    • http://www.gc-antey.ru/ckfinder/userfiles/files/rosem.pdfIn PDF document text
    • http://sun-green.nl/ckfinder/userfiles/files/65402774552.pdfIn PDF document text
    • http://stadiumhighschoolclassof1965.com/clients/0/00/0080f9a3d0f10e930bcfc39f0a940e94/File/mizadazadikunede.pdfIn PDF document text
    • https://tepihtrava.rs//files/kegilenupemokidak.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/ss3glu7m9nlfnjcniajhrk6h5m/fapazuxiselibadibajofak.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160754a8e3a74d---zanerabizuwaliwapufezu.pdfIn PDF document text
    • http://ingatlantv.tv/userfiles/files/33432899520.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/fadirizalipitulazivej.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a19775805b3---22682555613.pdfIn PDF document text
    • http://tebsc.com/clients/84181/File/zanegi.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/cqp68ofbih77b3t7flnrvdi29k/najosipa.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/rajogonuginuji.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/86r64nie5t8l8pdsir7s74u8fe/nupasitenujolu.pdfIn PDF document text
    • http://rapet.hu/files/46673122772.pdfIn PDF document text
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/d64a58ce1a52ff6668821e2512ffdf51/togovafirokezezewolatib.pdfIn PDF document text
    • https://verredistri.fr/xmedia/file/bawojimaga.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/sbj5q17d2ehg3hkfnl9e6qi9l2/dakebi.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/f1d96169fdeea41e5c3386374d46983d/3471290678.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/0482ec2c72dcb54fe8f6ffd7dae58b2f/4982121443.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/bb99bec6e1232b364c19ac081330c4a7/81551800580.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=word+for+anticipationPDF 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_off00010f5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F5D 17096 bytes
SHA-256: 7a534bda3bc98a912b57355a6808d7060cefe69c8176453494419faa7b72a855
font_01_sfnt_off00013bff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BFF 10260 bytes
SHA-256: 13baf60fc0e97811cf8e90790602e36f317c15775d5ce25727e5f505c4579d50
font_02_sfnt_off0001532c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1532C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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