Malicious PDF — malware analysis report

Static analysis result for SHA-256 28dd5cccfee6ad8b…

MALICIOUS

PDF

84.1 KB Created: 2021-07-01 00:57:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1b2fb44db56f1b125a8c9a872fe9845e SHA-1: ca897ac5b19cdbf45a31eea9bdf1bad2b18bcbe3 SHA-256: 28dd5cccfee6ad8bd77473f3a28f2669e70ed05599df0328db9f33138b7b320e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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
  • 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://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/hgtoqjcq45qgfngmgrd7gd7493/gemexexa.pdf
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/b868acd995680acb19f8c738137644b2/84662834070.pdf
    • http://kamennykoberec.eu/editor_uploads/system/files/jizuwaluvomekat.pdf
    • http://palazzodiaz.com/userfiles/files/neruzukukironulelagis.pdf
    • http://grapes4u.ca/sites/all/sites/grapes4u.ca/files/kemuvez.pdf
    • http://africa-emergence2019.com/userfiles/file/siwarazuditutanefizuk.pdf
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1607556477c50d---65302836094.pdf
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c88570c041f---86777341725.pdf
    • https://chiuman-hk.com/images/file/sukedurubajipegululiwa.pdf
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c338082ad97---taxerupumelematifa.pdf
    • https://inverpalmas.com/aym_image/files/60415778224.pdf
    • http://ijdssymposium.eu/upload/17402490393.pdf
    • http://mmprogetti.it/userfiles/files/gavopaliduvigagudu.pdf
    • http://beastyenergy.com/userfiles/file/42136622534.pdf
    • http://snap-drone.com/userfiles/file/61636184946.pdf
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160871eddc136e---lolukaweb.pdf
    • http://precedent.by/_newsite/images_from_html_editor/file/15352499962.pdf
    • https://mabuksusu.com/contents//files/voramota.pdf
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/cacb932ac7f20a89a318151989684244/12567764697.pdf
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16082c58ee62fc---rositugima.pdf
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160726905d8d2e---83481344569.pdf
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087b63d3fcc2---koraxudedijafasoxililuw.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=colons+and+semi+colons+year+6+worksheet
    • 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_off0000e2c6.bin
f98f0edc4620db1bd0943a8f31a4b301d0611ede66b4f18adc486fdcf6f60f4f
pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C6 11128 bytes
font_01_sfnt_off0000fca7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA7 16792 bytes
font_02_sfnt_off000114b9.bin
22275507ca7a594de94dcded570e5821e93f094de928c3509ee64903393a6be5
pdf-font-stream PDF embedded font (sfnt) at offset 0x114B9 18336 bytes