Malicious PDF — malware analysis report

Static analysis result for SHA-256 32008f600a923b2a…

MALICIOUS

PDF

115.2 KB Created: 2021-10-13 18:50:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: e43f63c999aca0b034260b3e737501c5 SHA-1: b6d1ec0e4ab2584166dd487abd33127d980a10c8 SHA-256: 32008f600a923b2abea6402ff5f1fe5687b29b7cb6f129b3d2a1a4472c116827
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to various domains, many of which are hosted on compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution through these links. The document body is unreadable, but the heuristics suggest a link farm designed to obscure the true destination or host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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://vietdubai.com/userfiles/file/vugir.pdf In PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/bb69b1c3639dd687bc9e7890fe242c42/lowurulijoxepekaxotubat.pdfIn PDF document text
    • https://am-system.eu/ckfinder/userfiles/files/89564039178.pdfIn PDF document text
    • https://hyosungulf.com/uploads/file/78682548591.pdfIn PDF document text
    • https://trainova.com/userfiles/file/89910171702.pdfIn PDF document text
    • https://tapetcenter.ro/app/webroot/files/userfiles/files/xowotavisokunodabiwal.pdfIn PDF document text
    • http://impex-italia.it/userfiles/files/60018231831.pdfIn PDF document text
    • http://lpxs168.com/filespath/files/20210901175235.pdfIn PDF document text
    • http://grafiport.com/userfiles/file/fibon.pdfIn PDF document text
    • http://domosplast.hu/files/file/89250047667.pdfIn PDF document text
    • http://azbuka-d.ru/ckfinder/userfiles/files/81968492552.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/5126a2dec1ecb5fc5af082f12aa02936/rujamugazuxifakipupuxul.pdfIn PDF document text
    • http://radiopoint.cz/userfiles/file/federewexexisezazuvurijal.pdfIn PDF document text
    • http://porebaw.niedzwiedz.pl/upload/File/goworibe.pdfIn PDF document text
    • http://ngocvietbungalow.com/upload/files/14999889328.pdfIn PDF document text
    • http://anm-av.de/uploads/files/91819253626.pdfIn PDF document text
    • http://maroba-zirndorf.de/file/53618517747.pdfIn PDF document text
    • https://cam-ceeds.org/ckfinder/userfiles/files/potegebudarurologajafule.pdfIn PDF document text
    • http://optykglowacki.pl/obrazki/files/lixavakitakubolo.pdfIn PDF document text
    • http://theclubburger.com/uploads/files/tonumej.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/26275265493.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/f4db7de457f3df6038d8f873b6174fed/14335130565.pdfIn PDF document text
    • https://szalkasszorutacskok.hu/app/webroot/files/content/files/sologudepak.pdfIn PDF document text
    • https://deltagroup.bg/uploads/file/patabikinubekosuxitapokex.pdfIn PDF document text
    • https://3visiontech.com/piceditor/file/bakigatekivawab.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/9dtfingffshrlstd5c5tqrh714/wexeloketabovodexejumab.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/u-9XGpgKpwY/uplcv?utm_term=cheers+to+new+friendshipPDF 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_off00015b03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B03 10504 bytes
SHA-256: b0d272f21c5a8e3b30d3b069f006346ba02901d208aee21c9db74037ba4970f5
font_01_sfnt_off000172f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x172F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00018b03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18B03 19728 bytes
SHA-256: f49d8f27ad126e9ea5ff70f4745258830024c2f53e2619d322a3c2ba08f57757