Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0173e5c08f2a038…

MALICIOUS

PDF

88.2 KB Created: 2021-07-14 03:48:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a603c84147fea8873e6e3e74e7cdb9f3 SHA-1: ec5c5632cc70d7cd9ef17016e6a4278789edf0f4 SHA-256: b0173e5c08f2a03853db96cd9600d3b2ce01356377972809aaf4bb8dec98e193
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Multiple heuristics point to the PDF acting as a link farm, directing users to various compromised websites, including those hosted on disposable domains and WordPress upload directories. The presence of embedded URLs suggests an attempt to redirect users to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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
  • 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://allytemp.ru/uplcv?utm_term=cs+executive+scanner+for+june+2020+pdf+download PDF link annotation
    • http://imssp.by/data/images/fxeditor/file/16351436911.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/nelaribarujugus.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9a24d230b4---49415434733.pdfPDF link annotation
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/qsthvdjufbh7d1fqk177nlhu9h/ruvadosekasejosava.pdfIn PDF document text
    • https://shriayurvednagpur.org/public/ckfinder/userfiles/files/44725925852.pdfIn PDF document text
    • http://ty-universe.com/image/files/20210602_075227.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/65b338335e13d60c01f9cec75d5d2b47/lijawuvuzewekaxaju.pdfIn PDF document text
    • https://handientu.vn/userfiles/file/73428898389.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160beb66b6afba---50701874103.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/90c44498c346769994ae559de00d6520/wipipawom.pdfIn PDF document text
    • http://seigyobannkaigaikikaku.com/ckfinder/userfiles/files/75504154023.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/1c2156f3185d83b699b63fb0d13cbafa/lodivisavuforobu.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/8827837427.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609536bb15126---39666055037.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/f2vvkc2q2lin1bm60u7f7i18j1/woper.pdfIn PDF document text
    • https://adikketiga.com/contents//files/18977953990.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-7-1/20210701221714573642.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/1j7qfr1d544nc6sceqoejmp27i/zunijeziduluj.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/obb872egtf6jct98emv775gm9b/ramobad.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/xijegololesiwamebabilo.pdfIn PDF document text
    • http://kentcliffordreunion.com/clients/a/aa/aa84b18e55fac3ff3c25336c5005d9e5/File/64399576343.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/file/55792810366.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f57913197---66985280379.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/286e81dbcd17b69d5084547ab2a3b8f2/safobobewov.pdfIn PDF document text
    • https://laser123.com/geektic/files/94338120113.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_off0000f030.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF030 18152 bytes
SHA-256: 831202c1e963260ac00192cc1a189e664f93dbbd241cca7c821d6e6c1bc50a39
font_01_sfnt_off00012031.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12031 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013848.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13848 11368 bytes
SHA-256: 24014d55b755de4aee93db914d361b56e791a8fa682bfd34232191ccb40a28e2

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