Malicious PDF — malware analysis report

Static analysis result for SHA-256 5db614b8f738fe5e…

MALICIOUS

PDF

88.3 KB Created: 2021-08-13 01:36:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b91648addee15f6fb6dc47a68c57d84a SHA-1: 27bd48da9a9b44dc7b2d6ce6d3589cf01fe878c8 SHA-256: 5db614b8f738fe5ea456c111e4ed591900f8ebf8479c28c93d51c63b6237de16
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning model indicated a high probability of maliciousness. Several heuristics indicate the PDF functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS upload directories. The embedded URLs suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607974fc8e55b---2167206412.pdf
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/60649949311.pdf
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/975193526cb454153c7707f0e9d4af15/tadatupaxo.pdf
    • http://aj-logistics.com/stock/userfiles/file/lolatipoxakitujopotipe.pdf
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160802fc61b943---gagunufebonezabawo.pdf
    • https://isleo.com/i_photos/file/18136058825.pdf
    • http://saipanbooking.com/FileData/ckfinder/files/20210725_C8F3A91B35AD05FE.pdf
    • http://blackivy.pl/userfiles/file/sekodepisus.pdf
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160756e42655af---popatofositunimutisuji.pdf
    • https://autotoner123.com/home/autotone/public_html/ckeditortest_WORKING/ckfinder/userfiles/files/55058578043.pdf
    • https://mk-sito.it/uploads/file/517544695.pdf
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d743f36a1---buzukivenev.pdf
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/1f1abd0ca42aaceaf20e6d48fabcba43/bikibox.pdf
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/80k7u7017kde7bs977dgg6hnr3/nakudagiso.pdf
    • http://gesundheit-im-blog.de/userfiles/file/nazuzugotiza.pdf
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b28c031675f---fubiratumozasupevi.pdf
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/28772a07ecd9f72e18a0f503a36a2d3a/dilatufifopadifanisebo.pdf
    • http://ruresept.ru/files/file/24105268306.pdf
    • http://myphamlulanjina.com/upload/files/buwimaraxomawazus.pdf
    • http://cutskytools.com/d/files/bapemimeverixiwunupogadid.pdf
    • http://vetcasatenovo.it/userfiles/files/81095201390.pdf
    • http://morethancars.nl/uploads/edytor/file/joxasefoki.pdf
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/192fd4acd49c3970cadf2d150736ca14/63220668486.pdf
    • http://appletechsolutions.com/userfiles/file/25186880569.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+get+my+w2+from+my+old+job
    • 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_off0000f728.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF728 16792 bytes
font_01_sfnt_off00010f3f.bin
958190270da152fb901b77045323b8575d38260fc45e0111fc28b025acbf009d
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F3F 10752 bytes
font_02_sfnt_off000127e3.bin
185feeb256304474edffef0185de0909dc36192201a7631267803e2c201b038b
pdf-font-stream PDF embedded font (sfnt) at offset 0x127E3 16728 bytes