Malicious PDF — malware analysis report

Static analysis result for SHA-256 0629f2b320d83e2e…

MALICIOUS

PDF

85.5 KB Created: 2021-07-01 21:41:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 6ad7797b863e45b6af5359d29deaf732 SHA-1: e190e10b6d11b9ef218afe6870fd7a3fadc97f40 SHA-256: 0629f2b320d83e2eeb3df80ae6ea0fa41ab539dedb6ec7094d588e9f37ba1c1e
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as Pdf.Phishing.Trojan. The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The malformed stream length heuristic indicates potential exploit activity within the PDF structure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://inwebjor.ru/uplcv?utm_term=kid+words+that+start+with+m PDF link annotation
    • https://tonymusic.se/UserFiles/files/rifedekerabota.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc995eb36db---nadoximinidenoronajarikep.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16092c8adf008a---gebujuzusomexuvadituka.pdfIn PDF document text
    • http://rubensova16.cz/files/file/mepujorezobigagekuronewe.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a762bae1e49---mevaruvemamabeseteji.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160b920e4f2dbf---jaxemujadapabogoga.pdfIn PDF document text
    • http://resheto.ru/users_images//fck/file/newekexa.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/5pf2jm56uu0bkclb99cvfoukt3/ludafofud.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/a6088767f6764c3f3b05c613960e9bb4/48696964188.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608d3d3201ec7---mabufunuzabil.pdfIn PDF document text
    • http://hi-techfiber.com/userfiles/file/90068794268.pdfIn PDF document text
    • http://score1forspencer.com/clients/4/45/4587145e2679cb7673d0e21b436e5c25/File/27836578320.pdfIn PDF document text
    • https://supermagnum-bg.com/userfiles/file/83566564481.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/milisuxutoximifodekaje.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/b7b625b8da7b499daaceb7da2cbfa0c7/34983856187.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/84764834878.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/ea0572b347b5d8df59ba7ae7b7808b51/gikugumilivufuwa.pdfIn PDF document text
    • https://avayemehr-carpet.ir/data/file/gavedakibo.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab1f5425825---vimeroguno.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160858eb697589---pepoxipom.pdfIn PDF document text
    • http://asokmontridental.com/userfiles/file/nesuziwibifaw.pdfIn PDF document text
    • https://lawrenceyezersky.com/userfiles/file/todolewarakixorevemavakav.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/kegerijezim.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ab7c4754268---89332051105.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/oqfqov0dm8uif4rigt7a1qvls4/xolijizik.pdfIn PDF document text
    • http://bsa.by/ckfinder/userfiles/files/buzasis.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec7ead2360---83137537298.pdfIn PDF document text
    • 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_off0000ee60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010672.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10672 16704 bytes
SHA-256: effd48a2b2f4fc442e3328736642143d4c20462f60eb00fd7f2c57acc89ad23a
font_02_sfnt_off00013173.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13173 10308 bytes
SHA-256: 0a73f3773734dfa681b3b4a7cebd02636e1bdc869aec95712e80b9504ad57353

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