Malicious PDF — malware analysis report

Static analysis result for SHA-256 a41aedc4e3c6e037…

MALICIOUS

PDF

88.5 KB Created: 2021-08-24 03:08:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5c89143d9afd3126a2dbf8cce917207a SHA-1: f930fc6ef7a279798688f9b82003938f4dff738f SHA-256: a41aedc4e3c6e037726234ef97cf0c73237bd2345f0e847a285b17e9c9b955a6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV heuristics strongly indicate maliciousness, flagging the PDF as a phishing trojan. The document contains a large number of links, many hosted on compromised CMS platforms, pointing to other PDF files. While no scripts were explicitly extracted, the PDF structure and link farm behavior suggest it's designed to lure users to malicious content, likely for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://advantagelic.com/singhania/downloads/file/zubewa.pdf In PDF document text
    • http://babamoleskine.com/files/file/davemawoxurinozi.pdfIn PDF document text
    • http://floridadressyourhome.com/uploaded_files/userfiles/files/ropubipiwunida.pdfIn PDF document text
    • http://wu-pao.com/upfiles/editor/files/4811632290.pdfIn PDF document text
    • http://greenbrier101.com/userimages/37467280845.pdfIn PDF document text
    • https://djennebeads.com/nbloom/fckuploads/file/vemisavonileva.pdfIn PDF document text
    • https://taevlingar.se/images/pages/file/99858914782.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087818029fd4---88382565226.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/0b03258f510b6a9652f22d638844d18c/46271100706.pdfIn PDF document text
    • https://hagepoorter.be/files/files/bexogazadub.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/ro9873ct11gojeoe5rtmptj2t8/79193638703.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/160abaa0c2a2f4---14010398316.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16090e006a59db---69198676123.pdfIn PDF document text
    • http://basaritarim.net/admin/editor_resim/file/xebobuli.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/71727385709.pdfIn PDF document text
    • https://yingzhaoliuart.com/upload/file/tenovesuware.pdfIn PDF document text
    • http://funagamex.vn/PhuongNamGroup/userfiles/files/vatujetusifetivawim.pdfIn PDF document text
    • http://studiotecnicobonoli.com/userfiles/files/46467688570.pdfIn PDF document text
    • http://madonnina.info/userfiles/files/ganibe.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/de8ee10b9286cd3e62871b3a68f18f3a/timenutaviki.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/64cc9804c54bee98794dfde7ceef303d/mujuvaligojekerat.pdfIn PDF document text
    • https://santechnikosdarbai.lt/images/files/96696545108.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/d1e7784582f3f98e7c7a6ca992ecc716/vujitosivekujuse.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aca4839f86---50106714940.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc6578e592c---60940480417.pdfIn PDF document text
    • https://seikico.net/img-tym/files/buzonukepirimexuteseji.pdfIn PDF document text
    • http://mulherinscampground.com/clients/879992/File/nopezerutos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=planting+corn+in+potsPDF 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_off0000f855.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF855 10420 bytes
SHA-256: 12de55553c331e4a5ede399bf32bdaa022321dfe9b86e82ef409903b440e653b
font_01_sfnt_off00011009.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11009 16760 bytes
SHA-256: 0019e965a3da0bc1f629de67bc90eebc2cb0368be3a367be02ed8c9ea85a1530
font_02_sfnt_off00013b8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1