Malicious PDF — malware analysis report

Static analysis result for SHA-256 d64cd1dd113ae53c…

MALICIOUS

PDF

82.5 KB Created: 2021-07-04 17:15:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 730a5948d79443beeb06ca109b9d8da0 SHA-1: b42e1cc5d366333a3cb751744436ca8104795f4b SHA-256: d64cd1dd113ae53cf6154b14d8ce30346515023c1582eb62b57615c70eb3a074
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, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites and other potentially malicious domains. The embedded URLs suggest an attempt to lure users to external sites, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16098a2b5c4e3e---17849101223.pdf
    • http://ampletrekking.com/userfiles/file/54450260022.pdf
    • http://erisalaw-chicago.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/43309946097.pdf
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c21c885503---jejugesekuxusanusipogetum.pdf
    • http://firanywiktoria.pl/uploads/editor/file/zukiluja.pdf
    • http://dancedynamicsla.com/clients/38740/File/1247916802.pdf
    • https://ivanda-commerce.hr/userfiles/file/gaseboxegawoki.pdf
    • http://myphamlulanjina.com/upload/files/nodufaxojujuwogejadavukaf.pdf
    • http://www.samlab.com.tr/wp-content/plugins/super-forms/uploads/php/files/h7vkg50vjsv7mf1mt4499a1rq2/letinuperawixaridaxijumu.pdf
    • http://taxilitomerice.cz/ckfinder/userfiles/files/46036803680.pdf
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/4a940ab46b83ed277ff08554f0bc9847/sutejumozej.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f1605db55---69884689099.pdf
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160921134bcb84---91666991500.pdf
    • http://gleneaglehoa.org/images/file/59553024157.pdf
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607e82d1106ab---torazaposumadanarawi.pdf
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/rpib762462r6b9co592fpauau5/purowibudiwanoriti.pdf
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adc56981d3a---tuwevopeturenevazuwawaji.pdf
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/np7t5aj7mbolf6rmssabfhbk5h/veguzosixegosovem.pdf
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae982f42d45---bitopizi.pdf
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609653ae72ab5---lanaxikidifape.pdf
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/qbvn816i05navh5ep8l9rrt840/18323575078.pdf
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607da21bd5cce---91412007994.pdf
    • https://soechi.net/userfiles/file/18996377023.pdf
    • https://cafemocion.com/userfiles/file/zuzemugopugo.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=add+pdf+to+excel+cell
    • 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_off0000e061.bin
05c382b3659b7b3c9f4a1090b4bc1ecc0514775e4e67ec4354b1e5cfaa44cce2
pdf-font-stream PDF embedded font (sfnt) at offset 0xE061 16924 bytes
font_01_sfnt_off00010ca5.bin
7b9b0658f6dfb06cc052a7f985ce8dc3e53bde6a4a5c38b172d8012e370659dc
pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA5 10072 bytes
font_02_sfnt_off00012336.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12336 16792 bytes