Malicious PDF — malware analysis report

Static analysis result for SHA-256 871f1481e32ef0b0…

MALICIOUS

PDF

86.8 KB Created: 2021-06-30 18:08:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: be9d209a80ec0da63416db63b906e1fc SHA-1: 406fe0647359b2b40dc37b3c85583edc79de55a1 SHA-256: 871f1481e32ef0b031a61977fbad406864f0e840a57e4279063f4cc9c5fefcf0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were directly extracted, the PDF structure and embedded URIs are indicative of an attempt to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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.
  • XFA form low PDF_XFA
    PDF uses XML Forms Architecture — can contain script logic
  • 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://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/0c2957bb03bf76c4adc8ef061c7d92a4/zevurexusikiparudiw.pdf
    • http://amirafouad.com/uploaded_files/file/manunakirazefiwajabu.pdf
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607885cfadd2a---1954979879.pdf
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1db545cf0---zaxolugoli.pdf
    • http://allasclub.com/campannas/file/70954325720.pdf
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081d01b96e8e---jokeruxigufalunulavo.pdf
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/9pha4kp147ks7gde7o9bthg4q3/kofes.pdf
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160881ebfd6fea---60649441065.pdf
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/ade01e07ed93a8c8c383858d94790d23/buwazarezutimebuj.pdf
    • http://bielwod.com/userfiles/file/40493776589.pdf
    • https://xn--90aweabvm.xn--p1ai/ckfinder/userfiles/files/46944641947.pdf
    • https://sealskinz.ru/files/file/90088027927.pdf
    • http://nacyc.jp/Upload/file/pamisumerag.pdf
    • http://animalscipublisher.com/files/upfiles/file/3304842912.pdf
    • http://fritz-fahrlaender.ch/download/96656366803.pdf
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/0nr5sv7tph3gcmu75cjolfcupt/20530241548.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/04544d425061e62d2113aaf82c3f5b51/vipezafofojuj.pdf
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/3411111ddc70112be75d241aa45b062b/85660053480.pdf
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c5752952fa---zegub.pdf
    • http://vzwsportenmuziek.com/content_docs/gulirilidabagiwil.pdf
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072910d98750---judamisudujigediwiripav.pdf
    • http://quanhoangtsi.com/upload/quangtri/files/88072470984.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=what+is+the+least+multiple+6+and+8+have+in+common
    • 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_off0000f157.bin
7c8fdca4dd58000ec72e12bd1c67bfedac5cc86354276dd1d1f019d42ec92852
pdf-font-stream PDF embedded font (sfnt) at offset 0xF157 16336 bytes
font_01_sfnt_off00011b98.bin
83d9df32c9425a5f723e20c87d58dc36c18933cece9d3069fcd8421cd9222037
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B98 11216 bytes
font_02_sfnt_off000135ae.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x135AE 16792 bytes