Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc87608d3291e088…

MALICIOUS

PDF

85.1 KB Created: 2021-09-05 07:37:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a31700157c6e0929ceb9b88a9313135d SHA-1: 0c13c846a795251bc4fb658c6d2cccf38d5d1fe0 SHA-256: bc87608d3291e0883b608f1a45f0cd78f114a1d82cfc913f64306fd2745ccc5b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as 'Pdf.Phishing.Trojan'. Heuristics indicate it functions as a link farm, directing users to multiple compromised websites and potentially disposable hosting. While no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/049451ae39fbf065680cafdabd1d5544/42356036640.pdf In PDF document text
    • http://safaraval.com/basefile/safaravalcom/files/15905454223.pdfIn PDF document text
    • http://www.vljainandco.com/userfiles/files/46749210843.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c67c5c09e04---86645563742.pdfIn PDF document text
    • https://shreenathtechnologies.com/userfiles/file/29589764329.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e8fc8929cc---24786132280.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/dei0q6i851oajk61pld48do7i5/29417192209.pdfIn PDF document text
    • http://antasboru.com/guvennet/resimlerfiles/20148300388.pdfIn PDF document text
    • http://jdjfjx.com/images/upload/File/fubijiwevewor.pdfIn PDF document text
    • http://www.icf-plant.com/files/file/9782788247.pdfIn PDF document text
    • http://momsystem.ru/public/file/waraforijexosofejutebu.pdfIn PDF document text
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/53968c8e0446495ebc7adc66f0b444f0/38954850090.pdfIn PDF document text
    • http://autohondl.cz/userfiles/file/kunerafevowowafo.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160afbcc90b8e0---leritiwurozewubofodisip.pdfIn PDF document text
    • https://2acontractor.it/images/file/27203856546.pdfIn PDF document text
    • http://panhongbo.com/ckfinder/userfiles/site_eachfun_com/files/21717826703.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/kadamazekofatarakir.pdfIn PDF document text
    • https://www.pactforfamilies.org/ckfinder/userfiles/files/63034321046.pdfIn PDF document text
    • http://ogledalata.bg/uploads/pages/files/35254358571.pdfIn PDF document text
    • http://atmaircenter.com/lb/userfiles/files/pivetezofodezonip.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608750627e365---68395742483.pdfIn PDF document text
    • http://nousgarage.com/userfiles/file/19654386460.pdfIn PDF document text
    • https://riolospettacoli.it/filesUploads/file/24488403046.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ad111078b63---jiwibadojazojidakukefev.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/3be30ba038c03df420803350542706b0/58123862139.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=benq+w2000+user+manualPDF 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_off0000e7a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A4 17888 bytes
SHA-256: 8f163d7d29a52b62d4f3b47ed3e05915644b3372401a13a155d24e1005005612
font_01_sfnt_off00011645.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11645 10584 bytes
SHA-256: fb800b1e933642daaaee75af0f8f232d9b5252f217888cc1c64c01f8d7e81a5d
font_02_sfnt_off00012e95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1