Malicious PDF — malware analysis report

Static analysis result for SHA-256 104c44cb28ddfcf8…

MALICIOUS

PDF

74.8 KB Created: 2021-09-13 12:27:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cdd0c8f1c51f43b0c120ef9fa267e1c5 SHA-1: dc38843bdfa87cd36f27ff57b50e02c7a87937b6 SHA-256: 104c44cb28ddfcf8ba86a8516e1f170331d77daceb2c9b35ce160b2189795a5e
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on disposable domains or compromised CMS uploads, suggesting it functions as a link farm to distribute phishing content or malware. The presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

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://inwebjor.ru/uplcv?utm_term=sampoorna+hanuman+chalisa+pdf PDF link annotation
    • https://digireg.lu/upload/tekumivesajef.pdfIn PDF document text
    • http://hoanggiaphatland.com/uploads/image/files/80521650162.pdfIn PDF document text
    • http://rorolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fulofamesepasesemoniv.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/42120737594.pdfIn PDF document text
    • http://thaifilmind.com/UserFiles/file/xamavutemopasifusibul.pdfIn PDF document text
    • http://lisaarkin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dabekixiziwazudumonaraw.pdfIn PDF document text
    • http://topflexsports.com/uploads/24391141517.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b498353621---38478401685.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/c58903cb219e4061ed6a3ada309dd57a/merama.pdfIn PDF document text
    • http://keletunderground.hu/images/uploaded_pics/file/kesidivonusezufevifexuxo.pdfIn PDF document text
    • http://asv-solnice.cz/_files/file/muledegapo.pdfIn PDF document text
    • http://alfatreyd-mebel.ru/archive/images/file/damopixesezewunezalajasef.pdfIn PDF document text
    • http://lightningriskassessment.com/ci/userfiles/files/15006208760.pdfIn PDF document text
    • http://taihegas.com/filespath/files/20210913165454.pdfIn PDF document text
    • https://dycmc.com/DATA/upload/files/202109130909149562.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613264b087cf6---funekowobuwowevusopuw.pdfIn PDF document text
    • http://sbriz.ru/userfiles/file/74502852756.pdfIn PDF document text
    • http://www.aunay-sous-auneau.fr/ckfinder/userfiles/files/vutupulizofur.pdfIn PDF document text
    • https://appchecar.com/ckfinder/userfiles/files/tuvajebujo.pdfIn PDF document text
    • http://puisan.ru/uploads/file/88641582771.pdfIn PDF document text
    • http://www.stemcellhairclinic.com/files/files/49213591535.pdfIn PDF document text
    • http://bluelakehomestay.com/uploads/image/files/99498546015.pdfIn PDF document text
    • http://abbwingslynnhaven.com/uploads/files/51875269185.pdfIn PDF document text
    • http://jeanchapleau.com/userfiles/file/mimizebafa.pdfIn PDF document text
    • http://ntvietnga.com/upload/files/lokizaxanoba.pdfIn PDF document text
    • https://srilangkapools.com/contents/files/38232842991.pdfIn PDF document text
    • http://sxnqx.org/upload/file/Fl202109021055062227.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_off0000c0ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d8c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C2 10828 bytes
SHA-256: 1103665ea198909062aea5d9361632bd5b67731828929ebd1ca29f70271e8370
font_02_sfnt_off0000f15b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF15B 16992 bytes
SHA-256: 4e8c5d3636e11b0f02f77f4a78cea5b6d6ddc589ec824717f1f74e7242932add

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