Malicious PDF — malware analysis report

Static analysis result for SHA-256 411945652bf73fe6…

MALICIOUS

PDF

86.9 KB Created: 2021-06-28 13:17:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d149f47dbd974811699f0ee0c2242b99 SHA-1: 281c8e96bea8fda1b1a3139811a98298b75bee88 SHA-256: 411945652bf73fe64095995c564eecb6d84c6ad26317276ed25aa5464330205f
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded links, many pointing to compromised CMS upload directories, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the heuristic firings related to URI links and compromised CMS uploads are sufficient to infer a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://www.deuba.info/wp-content/plugins/super-forms/uploads/php/files/ncr5qqhhp73ra4imcerjduvenu/36957471833.pdf
    • https://securitydm.com/slicice/file/nokelugovomibasuniwisugek.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/58aba8bcd21775cc54068d3492a27eee/40732224235.pdf
    • http://midel.me/userfiles/file/35323728045.pdf
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607526463162d---xuwitejovapowumawixowaga.pdf
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/aae5f5b074aa1d0818f9b5e18094ef62/70097751669.pdf
    • http://bmhs1963.com/clients/7/72/7286fd37811b7a5dece6e69924e4d5ab/File/neforuw.pdf
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/bug23a1cncpma4l7dham9kdsqg/3350070171.pdf
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16071208517fe5---dunuvafetodetijejemi.pdf
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/favikaz.pdf
    • http://theofficefurniturestore.com/ckfinder/userfiles/files/xowijifixeboxada.pdf
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/174g32q9598rk5qfgkd6s924ca/77603991931.pdf
    • http://computergramm.com/userfiles/file/sufagejelavupazotip.pdf
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/9d1b552e89a2977a8288178817d1abe5/18078121650.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609b8e7ede17e---31840851874.pdf
    • http://aplus.to/userfiles/file/25334857965.pdf
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/oldhf5aats34agsu8ju0ap5ao0/pilebadekoni.pdf
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071b7f23950e---giguxadabufo.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/b55hepmlquavpoh6hj04t515h3/23267363191.pdf
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc81c03168---67918994895.pdf
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/j0ciu47d85fib796jsnrovcfrn/92807774885.pdf
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/4350f6053eb8012bbc8f2da591d1ef39/reretufatiwanonew.pdf
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/vgoipimpjespfift870usu8015/39248961118.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=diploma+course+duration
    • 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_off0000f219.bin
c3fdbb33e36e1fd386147eed1a21f62bb39ecb37d31ccabcb2b0c666d33a7f50
pdf-font-stream PDF embedded font (sfnt) at offset 0xF219 16720 bytes
font_01_sfnt_off00011ddc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11DDC 16792 bytes
font_02_sfnt_off000135f3.bin
237b3dc20032515d19f5e007bbae5bb24df5a2b0f01db15863cfe68f9272424e
pdf-font-stream PDF embedded font (sfnt) at offset 0x135F3 10776 bytes