Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce1a3c41ae33b130…

MALICIOUS

PDF

79.2 KB Created: 2021-09-07 11:57:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1dd575355bcb88cbbc0c0f56109a04b1 SHA-1: 345919ec5cc797530da47956074f108d5754e1d2 SHA-256: ce1a3c41ae33b130e22e8a85ebdde05f01cae896ee795a8f95de04a656a565d2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to redirect users to malicious sites. While no scripts were directly extracted, the presence of numerous external links and the overall detection profile indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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 http://camel-republic.com/media/userfiles/files/jewamewokizoraranukab.pdf In PDF document text
    • http://newcityhk.com/userfiles/bulowe.pdfIn PDF document text
    • https://irantruck.ir/data/file/sifujuvasifavexa.pdfIn PDF document text
    • http://papaicountrylodge-longstay.com/user_img/files/leraruzubiritidedofote.pdfIn PDF document text
    • https://drsubhashawale.com/ckfinder/userfiles/files/weluxolavisebubu.pdfIn PDF document text
    • http://ya-ke.cn/admin/upload/sikujitazage.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/544ab6caf3ef4e15c201111c1920dfd5/42521639048.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b1d996b08c6---60353760645.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1606f92cf2173a---perevexowabaliko.pdfIn PDF document text
    • https://giga-tronics.com/userfiles/files/76434962547.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba39fc333a---20735290492.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/74915979847.pdfIn PDF document text
    • http://sumbulefendiegitimvakfi.com/resimler/files/seguwuliba.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/5cc164d64869b7aa394f30b383dcb1b5/fivemegedozibumivaziripik.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/72082598343.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210502133621.pdfIn PDF document text
    • https://hansenlight.com/UploadFile/files/78637224202.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081a8f185ad7---44031839493.pdfIn PDF document text
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eed483612d---zisivopabafoj.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a01e91e2bab---89096415790.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-9/file/1567004826.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/sanaw.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160c458fbc4589---gebusogesakojofipoziduned.pdfIn PDF document text
    • http://budoprojekt.eu/obrazy/file/sagofekitot.pdfIn PDF document text
    • http://www.oteliapelsin.ru/ckfinder/userfiles/files/genevorilaxiwiv.pdfIn PDF document text
    • https://www.phuketvillarentalandservices.com/ckfinder/userfiles/files/vabedag.pdfIn PDF document text
    • https://lentes123.com/aym_image/files/zosifumeginewi.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16083da1e6c799---petunaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=cambridge+english+handbook+pdfPDF link annotation
    • 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_off0000d012.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD012 11108 bytes
SHA-256: 746c390d122d791987e64983a0816e6768c5dffd2d0752ef7b7c852c19c64ce9
font_01_sfnt_off0000e947.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE947 17644 bytes
SHA-256: e91b359849062fc5ee07f7531b9a73b3e1f2f922022f3cb2d1a259a72084a261
font_02_sfnt_off000116aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1