Malicious PDF — malware analysis report

Static analysis result for SHA-256 aecdab22e9fcb33f…

MALICIOUS

PDF

73.6 KB Created: 2021-09-27 20:56:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 76397fc9280577139f98990c1e9dd47a SHA-1: bb748a544bd14fc1ca56c5dbebacceee9e93f4cf SHA-256: aecdab22e9fcb33f4a17ba6c753d683990150f4539ce2c70b9d7c43055da75c0
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to various domains, many of which appear to be link farms or hosted on potentially compromised sites, suggesting a phishing or malware distribution scheme. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this, indicating the PDF is used to redirect users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://huntic.ru/uplcv?utm_term=how+to+change+message+default PDF link annotation
    • https://styliststudios.com/imagesTE/file/68363501033.pdfIn PDF document text
    • http://fantalife.nl/userfiles/file/98990900615.pdfIn PDF document text
    • https://tutorlookup.com/ckeditor/ckfinder/userfiles/files/43772528572.pdfIn PDF document text
    • https://cosmopolitanhotelbg.com/uploads/wysiwyg/files/vitugidotofipemorobidux.pdfIn PDF document text
    • http://dotykbylinky.sk/_subory/subory/77755414645.pdfIn PDF document text
    • http://vektor-bezpeki.com/userfiles/files/45146732984.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/92264253139.pdfIn PDF document text
    • http://myphamvickwhitebeck.vn/luutru/files/52538463960.pdfIn PDF document text
    • https://doluhosting.com/calisma2/files/uploads/93629934894.pdfIn PDF document text
    • http://mariautonoleggiomarsala.it/userfiles/files/14217908530.pdfIn PDF document text
    • https://albertoangel.sinecsas.com/ckfinder/userfiles/files/76011489911.pdfIn PDF document text
    • https://jatransfer.com/userfiles/file/tirub.pdfIn PDF document text
    • http://elateridae.com/images/FCKeditor/file/vibuga.pdfIn PDF document text
    • http://china-baby-clothes.com/d/files/videsusupuwap.pdfIn PDF document text
    • http://newo.ru/files/files/bisezutedazigo.pdfIn PDF document text
    • http://duancanhotot.com/upload/files/16609004869.pdfIn PDF document text
    • http://talesma.com/E/file/15143436048.pdfIn PDF document text
    • http://ctcinsulator.com/uploads/file/bezemadugolumepip.pdfIn PDF document text
    • https://conexus-study-abroad-travel.com/ckfinder/userfiles/file/5565112661.pdfIn PDF document text
    • http://clickvay.com/upload/files/suwepowijedumazumimoxis.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/nkrfjpd4o1qp7rehq6s1kt3ujv/21717378718.pdfIn PDF document text
    • https://rakowka.pl/userfiles/file/81764982288.pdfIn PDF document text
    • https://jairdefreitas.com/ckfinder/userfiles/files/51461727786.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614699f8ea721---zopater.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/lodolukatofodavawunaw.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16138ffb27f8bc---81783472323.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_off0000b68c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB68C 19480 bytes
SHA-256: f0b6507bc81d0c161ef0f0947223907e955e88817842d4928a6708b17b40ec19
font_01_sfnt_off0000e7dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7DD 10908 bytes
SHA-256: 45e02fb35ef3377e5ea1192c30e50f9d948be47d7a9c403060324f1776bbea20
font_02_sfnt_off000100c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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