Malicious PDF — malware analysis report

Static analysis result for SHA-256 192798dfb40de836…

MALICIOUS

PDF

812.1 KB Created: 2021-07-01 10:15:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 3e424bd3bec0546d50091871bddd51bd SHA-1: aa84d025e9c0934a7dfcac1031618fbf34b70ea4 SHA-256: 192798dfb40de836e5a28f6ff9a55d8837ba30f347f259537c5983f28a7e6191
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and ML classifiers, indicating it is likely a phishing or trojan distribution attempt. The document contains multiple links pointing to compromised CMS upload storage, suggesting it's part of a link farm designed to redirect users to malicious content. The presence of external URIs and compromised CMS upload links indicates an attempt to host and distribute further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5274

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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.
  • 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://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad484b96e3---fonulazozerenutupa.pdf In PDF document text
    • http://perlawarmii.pl/userfiles/file/risakesegajovit.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/61904273234.pdfIn PDF document text
    • http://hanasushichoice.com/uploads/files/63797008131.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/52931db5832edb04ad2518ba3b0b20e2/8027683164.pdfIn PDF document text
    • https://www.explosivo.gr/wp-content/plugins/super-forms/uploads/php/files/f4fee996a2c1aacd14983f783f54bb1f/4839255495.pdfIn PDF document text
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/aaa2861c797e19a9d4baf88b88bf08e4/velakomemorinoreda.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc24d781a3a---vedavidoxorulubosop.pdfIn PDF document text
    • https://sportsht.com/userfiles/file/66016469466.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4d8c48462f---jekug.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/gofisuke.pdfIn PDF document text
    • http://cesishotel.com/res/wysiwyg/file/zeronogopefiroromu.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baccad4e094---79041855115.pdfIn PDF document text
    • https://radmangroup-ye.com/rgfiles/file/raguruxaw.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/45857c34839aa81fd645157cd946d75d/gejelagutiji.pdfIn PDF document text
    • http://k1a.ru/images/files/file/tivuwezujed.pdfIn PDF document text
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/14f4240cd504885a401880854a2c94dd/tumogazezaguruvixaxod.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081b4a973d6f---vafusujajopitexemo.pdfIn PDF document text
    • https://pui-vital.ro/msg_media/file/5912263318.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160725db5b3b74---bugipetibivaralirur.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/de8bc316236a54fcb5b45ef8012e64fc/duwelejivi.pdfIn PDF document text
    • https://dynasty888.com/image/files/20210603_065427.pdfIn PDF document text
    • http://pulsarvn.com/media/ftp/file/zubasipilunivusadugel.pdfIn PDF document text
    • http://smolensk-bakaleya.ru/userfiles/file/xudasamemo.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/15b555dcec75249209e335524b46f094/lorinedopiditogifofodaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=gaither+vocal+band+members+past+and+presentPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000c22a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC22A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000c3ac4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3AC4 11024 bytes
SHA-256: acd8b8c581f9f235314e8e31b48201cb4e7b2936d31596c13782d0678ddcc01d
font_02_sfnt_off000c540d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC540D 16164 bytes
SHA-256: fd494554c7a7a2c4488382a78096c535ff133766c7221992be4f6a58596b2467
font_03_sfnt_off000c698b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC698B 19440 bytes
SHA-256: 06f9f884c6e34bb2cbe929ad61dcf4a9df50285d84a1de8913e2a61d9d5f2601