Malicious PDF — malware analysis report

Static analysis result for SHA-256 98ccc851f33eb9b4…

MALICIOUS

PDF

85.3 KB Created: 2021-09-21 00:43:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d9a0e210e415cfd6e6db4bb7ce2c5520 SHA-1: 2fa829d0d30340fbef1cb5471703bf9356c26af8 SHA-256: 98ccc851f33eb9b4066750ae2e896dd1f2fd889bc405bfbb4044ae6b96217a5d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the PDF structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://synerhu.ru/uplcv?utm_term=best+gta+5+like+games+for+android PDF link annotation
    • https://onhimalayas.com/ckfinder/userfiles/files/vutinobip.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/10562729427.pdfIn PDF document text
    • https://thietbixanh.net/uploads/files/mekegajuta.pdfIn PDF document text
    • http://daglichtfilters.nl/ckfinder/userfiles/files/27613985356.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/17643558623.pdfIn PDF document text
    • http://aktifimmo.lu/userfiles/files/fesipotilomezidabijigelur.pdfIn PDF document text
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/38973241907.pdfIn PDF document text
    • http://jubileejec.com/userfiles/files/14273265006.pdfIn PDF document text
    • https://hijaustabilo.com/contents/files/79955906791.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/nofofuzodotegapabuwipuj.pdfIn PDF document text
    • https://kanat.com/upload/ckfinder/files/38192493231.pdfIn PDF document text
    • http://www.smpnuenen.nl/images/files/notiwubimuv.pdfIn PDF document text
    • http://www.puhito.hu/uploads/ditotaka.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c488fa37ad3162d03b220f677d6f80d8/46455641555.pdfIn PDF document text
    • http://kkslavicin.cz/sites/default/files/file/50550439409.pdfIn PDF document text
    • http://kleinschadenexperte.de/userfiles/file/10251852397.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16147deef9a948---zovinukuwisazin.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/fd0f3739cbd12de4089e4de7e57686e3/tizokosavan.pdfIn PDF document text
    • http://poslovniimenik.net/firme_data/files/xufirekuzuwavirevupuzono.pdfIn PDF document text
    • http://avvocatoandreabruschi.it/userfiles/files/limatizedixokaregozaj.pdfIn PDF document text
    • https://coombs.gocascadia.com/images/cms/file/90239504878.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/murun.pdfIn PDF document text
    • https://tiemhoamo.tiemhoahaibara.com/data/dulieu/files/66812669020.pdfIn PDF document text
    • https://marikakozmetika.hu/editor_up/76707723233.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_off0000eb2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB2E 16752 bytes
SHA-256: 799a9199a8211b96ce7d60233d377c1822209ffdf11e81a0416bfec1156c67b1
font_01_sfnt_off0001167c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1167C 10976 bytes
SHA-256: 0a7da0debef3a183623a6fcc433bf6e56821d3fb2a38dd79d8197f85ec00c1ad
font_02_sfnt_off00012fd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FD1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1