Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ca8711000602e43…

MALICIOUS

PDF

77.3 KB Created: 2021-09-10 01:09:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9e3031ca399e4ef3579d3b12f62810ff SHA-1: 6408bb55f102c7aa051ff917f8c699e440b9af32 SHA-256: 4ca8711000602e43fac42f628b20e10d85e16ec13c83161f71625f32b11abfe5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as containing a link farm and being a potential phishing or trojan delivery mechanism. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of numerous external URIs, including one pointing to a compromised CMS upload, suggests the document is designed to lure users to external resources, likely for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://allytemp.ru/uplcv?utm_term=how+do+you+block+a+number+on+a+flip+phone PDF link annotation
    • http://hoya-system.com/uploads/files/202109100551117038.pdfIn PDF document text
    • http://jaatkinson.com/userimages/fowinaxodajipigad.pdfIn PDF document text
    • https://www.medicalbi.com/ckfinder/userfiles/files/puzenex.pdfIn PDF document text
    • http://folientastaturen.pl/_data/file/82599364102.pdfIn PDF document text
    • http://museodegliarazzimarsala.com/userfiles/files/49428719941.pdfIn PDF document text
    • http://webspace.mysdam.net/images/newsletter/files/pevexob.pdfIn PDF document text
    • https://mangallagn.com/images/file/sakeroruwurulipabefexotej.pdfIn PDF document text
    • http://placc.info/up_image/zilovibufusu.pdfIn PDF document text
    • http://trovas.com/userimages/xuvavipakuxogugikebi.pdfIn PDF document text
    • https://implantsdentairesdesmoulins.com/upload/editor/file/84874241533.pdfIn PDF document text
    • http://popmetre.com/news/files/71034261385.pdfIn PDF document text
    • http://klccpa.com/userfiles/file/goxijoliliva.pdfIn PDF document text
    • http://upakuika.com/img/file/77430635231.pdfIn PDF document text
    • http://azbuka-d.ru/ckfinder/userfiles/files/12049661781.pdfIn PDF document text
    • http://sakem.org/userfiles/files/2538366698.pdfIn PDF document text
    • http://zs-oilfieldequip.ru/d/files/50389634314.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/9144e82f1466544ef4a090bace65c81a/53477824159.pdfIn PDF document text
    • http://novehorizonty.sk/userfiles/file/siwika.pdfIn PDF document text
    • https://mimpisiluman.com/contents/files/kanimifebakedalox.pdfIn PDF document text
    • https://onlineadda.organicemall.com/ckfinder/userfiles/files/95658115881.pdfIn PDF document text
    • http://geriatriccarenewjersey.com/userfiles/files/fuwifiderutebevuku.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/iq95jd3s5uhh7o4q6sb03r4s83/lajirosem.pdfIn PDF document text
    • http://hoshitorionline.com/uploads/files/lufuratozodekakugubon.pdfIn PDF document text
    • https://giridhareye.org/ckfinder/userfiles/files/dabojebugopedadulaxaxe.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/0gjddc3ipaah02v1d1ufkjlu0b/xulibivesudek.pdfIn PDF document text
    • http://heldermusic.nl/ckfinder/userfiles/files/tetirotijumam.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_off0000c7e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dff3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF3 17624 bytes
SHA-256: d228266c35ee928f690e60306532f1d6491b1e3de924e53f50e10671ddac6b1c
font_02_sfnt_off00010dde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DDE 11140 bytes
SHA-256: 265b1f08bf76444d57cb7572d1b82ea7eb50cf5ea1698d13339fa91a14e8a2e6

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