Malicious PDF — malware analysis report

Static analysis result for SHA-256 f115bfc81594bbd8…

MALICIOUS

PDF

85.1 KB Created: 2021-06-30 22:18:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 70d495940cd32414b5cbec81e202cd88 SHA-1: a1e9801bd05a5e8bd9d2acfe9057f8ac3679fdbf SHA-256: f115bfc81594bbd8e1efc123aec6a21680c24599becbaf9b0053a1479a84ef23
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of links, many pointing to compromised WordPress sites and disposable hosting, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://medtek.vn/storage/file/70788915972.pdf
    • http://jamesirvinewedding.com/clients/f/f9/f947a18657f5d77a8fcd192ffd4ccf25/File/39596748809.pdf
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16093c91d28a5e---50622471674.pdf
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/510f5d7a894436295bcf25fc8a1eadeb/63885940485.pdf
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/u6caiuirc36udukv0d5lvbauf5/mumuxurirorerufi.pdf
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/51b1c73543a1ac81b12247030dc093d7/63725576626.pdf
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160afb4c0df9ee---34585249747.pdf
    • http://savitapiti.org/ckfinder/userfiles/files/wejufakenizusoxixok.pdf
    • http://graham1978.com/clients/79565/File/sodowapuniwavewosafomu.pdf
    • https://ferropula.hr/files/60378016248.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076850f1b439---julojumawuda.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16075ab3d5dd97---pamusirigevitugowavuzi.pdf
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/7409ceb9c4bda9ed611f2ed269764590/mefijumexeta.pdf
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/e966caef5a33d22386a9dd30b1bb7044/58490444741.pdf
    • https://hfdjet.com/wp-content/plugins/super-forms/uploads/php/files/0edc7d0d127505c0ff73eaae5ac1005d/xodufelozubi.pdf
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/ffc7a863e5f1a94d62ad0973beafc170/94137875261.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cdfb9d7ab25---12785828464.pdf
    • http://karmand24.ir/basefile/ehotel724ir/files/3769600682.pdf
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/b09a5962e4fba7f7b87386457abe4874/basom.pdf
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/c8103d84f4fc2d2364f0e3f14b99f2ca/bowezisaxez.pdf
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607407092dd6a---23965617902.pdf
    • http://bloomx.com/sites/all/sites/bloomx.com/files/58226251960.pdf
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/vq58mdcmojeqqiro0bghbbg112/83826476801.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=outer+mars+palmistry
    • 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_off0000eb05.bin
3d234ed4d1fbf32276db7901e790445e7f154f5d8ef9020fbd1ea157c244c340
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB05 16704 bytes
font_01_sfnt_off00011635.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11635 16792 bytes
font_02_sfnt_off00012e4c.bin
e5042086c066ca62bb8beb082006e7bf8d044febd7577dac628e5165706d6f79
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E4C 10428 bytes