Malicious PDF — malware analysis report

Static analysis result for SHA-256 16a5fc71adcee315…

MALICIOUS

PDF

82.0 KB Created: 2021-09-06 16:59:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cab1d527a6569015e17824105d197191 SHA-1: 55fae12b973cce76b75703d006e4feb877b97fd6 SHA-256: 16a5fc71adcee31568c59629ae61938a27f5a840bdce426abe3b4502e71af6da
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting, likely intended to lead users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights the non-clustered link farm nature of the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://inwallendorf.de/userfiles/file/ganoja.pdf In PDF document text
    • http://haithuanphat.com/uploads/files/94201658257.pdfIn PDF document text
    • http://kientrucphatloc.com/upload/files/92683170527.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/6ce650ad93f9080da9e419ed89d72d54/kinatonujiwafezifadilanip.pdfIn PDF document text
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/c859737e59fc24d96a759b59edfe630c/61471015628.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/b2628a047922f805195d027e6ec5a9b9/61942410250.pdfIn PDF document text
    • http://tuanayapim.com/rsm/files/84539204868.pdfIn PDF document text
    • http://centroolosprato.it/userfiles/files/22649333415.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/82706121992.pdfIn PDF document text
    • https://atlaskvartir.ua/data/uploads/files/55106199326.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e86c6989c---62427198913.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16094d7f63e95b---pujup.pdfIn PDF document text
    • https://kotata-zlin.cz/obr/clanky/file/boxuvowudejufobujokodo.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092bda494e73---satipiwavunuxifotu.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/17986894734.pdfIn PDF document text
    • https://vzglavniki.net/data/file/58886964003.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc532b3c83---damakudosavixole.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/47171363741.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/35mis6de8cr0dd78hfjtujp5f1/vuredumafixerajoseteg.pdfIn PDF document text
    • http://platcometals.com/images/file/fajasedosajetawowopobipuz.pdfIn PDF document text
    • http://www.hausbaumesse.at/ckfinder/userfiles/files/rivuwemamozivekopelamen.pdfIn PDF document text
    • http://arebiatours.com/uploads/files/50101698168.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4ujrjrc5vqdmd7e9bmr6jviuq3/67869448439.pdfIn PDF document text
    • https://suksesunited.com/contents/files/puxukawiroxuxunosowatu.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/94817454999.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/e22133098dfb3cbd106864f463e45022/75184451696.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=exemple+de+lettre+de+demande+d%27attestation+de+stage+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_off0000d725.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD725 10960 bytes
SHA-256: ec9ed6b78670c2c5338058c06876e1dfb097fa1917856551dd658d9b13013d0d
font_01_sfnt_off0000f05c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF05C 19508 bytes
SHA-256: ffd8e4714d7356aa23ec2d1963143e4598897dabeb74388966d73f841fdbac0b
font_02_sfnt_off00012190.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12190 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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