Malicious PDF — malware analysis report

Static analysis result for SHA-256 55c030887661553e…

MALICIOUS

PDF

84.5 KB Created: 2021-09-13 22:17:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c493f7f6d44a7e1dcafbc65977b1d9da SHA-1: 45cc319fe2f1174ee17a43ad8e5a35439d763675 SHA-256: 55c030887661553e9f7dcce5660c6a074b2e7139d185c548c73945ccef8fb3b1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links pointing to compromised WordPress sites and other domains, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of embedded URLs and the nature of the heuristics point towards an attempt to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://crysiq.ru/uplcv?utm_term=dark+play+green+apk+2020
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613157778c043---dajuvixazegiv.pdf
    • https://indoshaolinkungfusociety.com/ckfinder/userfiles/files/54716370974.pdf
    • http://incomingmakedonia.com/files/files/64115657254.pdf
    • http://maasmartcity.com/userfiles/file/68244581066.pdf
    • http://polimak.pl/userfiles/file/nufeforifurosa.pdf
    • http://offerseir.com/basefile/offerseircom/files/77857169414.pdf
    • http://jedzenie365.pl/ckfinder/userfiles/files/tojewijikedobololivof.pdf
    • https://y3stwk65l-mn9.com/contents/files/kanigaxipagedexijoxokip.pdf
    • http://oticonshop.com/ckfinder/userfiles/files/nugiwuvonutemosukaxiki.pdf
    • https://universitecentrale.net/uploads/FCK_files/file/96640905064.pdf
    • https://ivanda-commerce.hr/userfiles/file/8285903192.pdf
    • http://totoumi.jp/upload/file/wopunirazuxesijoba.pdf
    • https://gretajensen.com/ckfinder/userfiles/files/51089371874.pdf
    • http://mtkshop.com/images/uploads/file/jodimitoleposezekunuvol.pdf
    • http://drcleancenter.com/uploads/files/202109080458283895.pdf
    • http://hoteldarim.ir/basefile/hoteldarimir/files/dadamasewud.pdf
    • http://cokhivietuc.webthoidai.com/img-vietuc/files/53132251276.pdf
    • http://timavoshipsupply.it/userfiles/file/budalep.pdf
    • https://alihuata.com/userfiles/file/pedube.pdf
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613a25458fb7f---jebusopawise.pdf
    • https://mraos.com/web/userfiles/file/poposerad.pdf
    • http://oreoltour.ru/sites/default/files/file/kazepatopo.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130302254cba---84106490883.pdf
    • http://drivingtesttips.ie/fckeditor/userfiles/file/tosipajiniku.pdf
    • http://pasaru.com/upload/files/jekulebemanusi.pdf
    • 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_off0000e3cf.bin
4eff594ac9c58591f4515ba92c0374120f113797f3e190586869475205ce14d1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE3CF 10400 bytes
font_01_sfnt_off0000fb86.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB86 16792 bytes
font_02_sfnt_off00011398.bin
75b054190474ae51570d7f7943db65f4966288e690eccc6e5319b1d02b714d39
pdf-font-stream PDF embedded font (sfnt) at offset 0x11398 18700 bytes