Malicious PDF — malware analysis report

Static analysis result for SHA-256 d011f2afd3b89216…

MALICIOUS

PDF

71.5 KB Created: 2021-09-30 11:21:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 6ddb9c739c206697d931d617ef76f3a3 SHA-1: bac184ade1ec153e4f26bdb8c7043131c4b024d6 SHA-256: d011f2afd3b89216aea38c92c96f0e40ce3761eab7784165b8edfc06df669ca9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous external URIs and is identified as a link farm, with several pointing to compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://synerhu.ru/uplcv?utm_term=droid+transfer+free PDF link annotation
    • http://ustunongel.com/image/files/vebojarubuwip.pdfIn PDF document text
    • http://kliknetezde.cz/admin/obrazky/file/pemotibojebiw.pdfIn PDF document text
    • https://pgp-puh.hr/fck_media/file/31655077568.pdfIn PDF document text
    • http://bbfrontedelmare.com/userfiles/files/4878999018.pdfIn PDF document text
    • http://hennel.hu/sources/elemek/file/xozowoton.pdfIn PDF document text
    • http://anpo.vn/upload/files/30060728367.pdfIn PDF document text
    • http://myphamasia.net/upload/files/wajeriregunejipixaxure.pdfIn PDF document text
    • http://express-service-auto.fr/ckeditor/ckfinder/userfiles/files/xepofet.pdfIn PDF document text
    • http://jn-zhsc.com/upload/zorovemexodural.pdfIn PDF document text
    • http://tostonet.cl/ckfinder/userfiles/files/35018925738.pdfIn PDF document text
    • http://avvocatoandreabruschi.it/userfiles/files/gozexedijalutu.pdfIn PDF document text
    • http://aaronandanthony.com/userfiles/files/jukovaxupitalar.pdfIn PDF document text
    • http://machin.kr/userData/board/file/3086067048.pdfIn PDF document text
    • http://jfhconsultancy.nl/userfiles/files/77051006049.pdfIn PDF document text
    • https://kratky.eu/files/file/suwegetovobilalejedi.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/a37b78f5ae2687709e92ab41141519b7/xexeluve.pdfIn PDF document text
    • http://megalabsrl.it/userfiles/files/vagogalesekiwoler.pdfIn PDF document text
    • http://toshiteriyakiburien.com/uploads/files/jurotevinidano.pdfIn PDF document text
    • https://deesudcoolingtower.com/userfiles/file/12885861699.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137454130e74---53372251205.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16151604bb8cc6---jaxikutexu.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/57dukvibvdjbot4ifd5kjuels0/zilagagijobomirudegeno.pdfIn PDF document text
    • http://slesnick.net/userfiles/files/wabuvatapajapokedesed.pdfIn PDF document text
    • http://gangwonbnb.com/FileData/ckfinder/files/20210925_3BF731E8775A850F.pdfIn PDF document text
    • http://resortvillairene.it/userfiles/files/bevefekorovodaniwif.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147fe9503a15---jejobogenanosexum.pdfIn PDF document text
    • http://samurairamenbar.com/uploads/files/gidet.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/kafujag.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_off0000b723.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB723 10300 bytes
SHA-256: 294ea525ed14b9a79e5314a1f9eef20b218a503f9d469e21307a8b70f2232b6d
font_01_sfnt_off0000ce73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE73 16360 bytes
SHA-256: 0941985ee5913f54fe54f4829646dc8f014b69ab1c68eb37ac44757771e1a706
font_02_sfnt_off0000f82a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF82A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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