Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa715ccf7852e833…

MALICIOUS

PDF

99.3 KB Created: 2021-07-21 12:00:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: bca4a504e79b172a4b73db6d4f59c0a9 SHA-1: c4c0d5192e19ab7ae1e8e76eb5f84e7b6f29f41d SHA-256: aa715ccf7852e8338b1c4cf9def1bf8336e874f5c3fbdb3ba35a4abcd2cae0e0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress sites acting as link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery. The embedded JavaScript is a common method for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9784

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/03bb872b2a119296a541a418e2a24be6/93733718439.pdf In PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/9d59508130a4915d63e2d7b5a3351761/19503328869.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/4137oivaok050otuqnrthjjjsk/wuletifigoguvigupokiduvuj.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0ea50ac83---zegokafazipufetujeja.pdfIn PDF document text
    • https://papersacksfactory.ae/images/bulk_images/files/31132247906.pdfIn PDF document text
    • http://chelseacarpet.com/ckfinder/userfiles/uploads/23825360397.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbd0dd6111e---88794844199.pdfIn PDF document text
    • http://emilymillerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/81611925074.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/s939mrdv9atvo3rimhbircj2c4/kikebidoralusukanifubax.pdfIn PDF document text
    • https://ofertaromania.ro/ckfinder/userfiles/files/18340839459.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f004f934477---9422198875.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/b37d4f16659ca33c909e91678ebc29e2/ratugu.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/5bb4bc722948e35870b91bd6a9912898/72125084519.pdfIn PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/81285854760.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb74158f4f5---kamekurigazunijidamududak.pdfIn PDF document text
    • https://stijsr.com/userfiles/file/75267313452.pdfIn PDF document text
    • http://blow-w124.com/js/upload/files/22337785764.pdfIn PDF document text
    • http://sns.hu/_user/file/47952705539.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16081672b1ab73---sepesesatisuwabakisu.pdfIn PDF document text
    • http://angeladaniel.eu/uploads/files/vevugajasiwog.pdfIn PDF document text
    • http://bendhigh1970.com/clients/1/10/106e6567aa8bd3cecf4080670b11bd10/File/90110440194.pdfIn PDF document text
    • https://rajatotogroup2.com/contents//files/maxagofotewujezu.pdfIn PDF document text
    • https://perfecthospitals.org/FCKeditor/file/99795867899.pdfIn PDF document text
    • https://observatoire-omic.org/documents/file/jozibul.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/a38ce737db9d387d7dd641f551c9e2df/58477359171.pdfIn PDF document text
    • https://booknowrentalimo.ch/userfiles/files/pewojolo.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/ad19990b8a8796e924e2bce9115308ba/jiboxezunuda.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=articulation+meaning+in+musicPDF 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_off00012194.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12194 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000139a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139A6 17548 bytes
SHA-256: 491d13dbf4a4ed078f4f940b6fa42cf83876c06190d0c65ee7be686007640c26
font_02_sfnt_off00016735.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16735 10656 bytes
SHA-256: 2e636a208cc7bee887d4860cce4774b2a9a02ffcbfa2f0fe3d98589b5876d288

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