Malicious PDF — malware analysis report

Static analysis result for SHA-256 345318791824b36d…

MALICIOUS

PDF

88.2 KB Created: 2021-07-28 08:32:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: db6669f6867593e6f625f70bdb2ded85 SHA-1: 11ddfcddc01306f9f3f3ede110251cd0bddcb2a8 SHA-256: 345318791824b36db75138c114d4a9174260d4bd94a8c1e78de77bc5f05e2538
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://allasclub.com/campannas/file/30844654456.pdf In PDF document text
    • http://aisef.org/uploads/userfiles/file/file/nokogefibipate.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/ribikerakedi.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16078cc21e7216---femaletoluzowinixarileb.pdfIn PDF document text
    • http://congtyvima.com/images/Download/kuwigoladubajogotosajiju.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607686327a944---23013151865.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/65556551881.pdfIn PDF document text
    • http://szpital-sulecin.pl/images/fckfiles/file/36628949888.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160eca406f1d63---gejogedorikolif.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/5abf162fa7eb8e5c49d3e0b435ffa6a8/7212199367.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608d8d624bf8a---dasixibidekebemarufebot.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16073dafa638f2---dasefelinatajaxiver.pdfIn PDF document text
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9f031cd9c---mimazojeki.pdfIn PDF document text
    • https://privatecambodiatour.com/userfiles/file/vezikuluxofi.pdfIn PDF document text
    • http://cosyromania.com/media/file/50528299026.pdfIn PDF document text
    • http://jyotiacademicpress.org/uploads/file/8469595798.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b0a1862d95---tugipenosefutuseleku.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/qce5k56m5u4aipqpshlbvgtk67/86947769999.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/jarafi.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e832ed8df67---setilatogonifure.pdfIn PDF document text
    • http://thebankcardservices.com/uploads/files/rakuji.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/68910928049.pdfIn PDF document text
    • http://aliglobshop.com/userfiles/file/maxulobevin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=how+long+does+it+take+to+cook+a+3-lb+corned+beef+brisketPDF 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_off0000efca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCA 11164 bytes
SHA-256: 3dac627d1f70f8a83372df9cdf376f93f70287ffa21463800b28aae65a429fd2
font_01_sfnt_off000109ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109ED 17764 bytes
SHA-256: 26ed8954d11640efb9f15812be4779292068128769c829364184e65a8155e2cb
font_02_sfnt_off000138c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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