Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0bdbd17cea4a40a…

MALICIOUS

PDF

225.1 KB Created: 2021-07-02 07:37:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c9e34ffb03ced1406492aae9ef0d0d3c SHA-1: 7aab782123e9b606464da03271d27b994b6e64d6 SHA-256: f0bdbd17cea4a40aa2f38a681e2e9a99c2fa24fd612035c1e6327c8f5672fdb6
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by ClamAV and an ML classifier. Heuristics indicate it contains a link farm pointing to compromised WordPress upload storage, likely serving as a lure for phishing or malware distribution. The PDF structure and embedded URLs suggest an attempt to redirect users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd9eaa8a2f---27788836782.pdf In PDF document text
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3996428b9---nezazamonitif.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/4e668e2b5416ee8c01470fe3c4e2bad5/jakiziranodag.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/35961187252.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/tcn2h1prln2o0hgo4dtgcdbms4/26063324584.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074847bac8fb---22385294594.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/87425742271.pdfIn PDF document text
    • https://berbagiangka.com/contents//files/89068822642.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/sorbl0mbemdhmi3fl4h8d2lfu6/tisogimukegeguzafo.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3da981566---dafotiruvonulijusukunakup.pdfIn PDF document text
    • http://matras-devison.com/upload/file/8213201710.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16096cabab2b2c---40548811374.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/0gqqakqea2cfo98nie14l5p9eb/13378835289.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bc1da2048aa---nalototo.pdfIn PDF document text
    • https://ubk-sad.de/azubi/userfiles/files/foxiz.pdfIn PDF document text
    • https://noddy.nu/images/file/bisowepabawura.pdfIn PDF document text
    • http://tuvanluatdanang.com/upload/ck/files/lirutavajejud.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609883bd51e70---wubisawugovat.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16087906ac8126---mavuzugi.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/donutigepokagakupidewuza.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/52025674865.pdfIn PDF document text
    • https://carea2plus.com/wp-content/plugins/super-forms/uploads/php/files/706f26b578f328cea9d0c76c51de70d3/43196892519.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/thbuqdet51usb81hql28rmgtv1/23386690179.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/27bn5i6a1l3okrtquusvpea8em/rewifimikalubit.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090f13819ca4---59258138526.pdfIn PDF document text
    • http://dailyxedayhang.com/userfiles/files/45761123167.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ceed23d04bc---kapodo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=real+time+hyphenPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0003165b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3165B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00032e72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x32E72 10288 bytes
SHA-256: afc55226d37bd408f1f9590dfbc1ba41a5204173cbb08947551a7906009c43e1
font_02_sfnt_off0003455a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3455A 19132 bytes
SHA-256: a05a84f6107a2c5324453488b453cd2502045b3169747086b0688680fa127a35