Malicious PDF — malware analysis report

Static analysis result for SHA-256 f47bed4e0f8723a7…

MALICIOUS

PDF

80.6 KB Created: 2021-09-23 00:32:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: af1b04d8edb0526068e2d46c2d2ac7a3 SHA-1: 9b3656b7f8577bff2771d723f28de18034886ed4 SHA-256: f47bed4e0f8723a7b965c90d8a7f5013b3fafd0dced4922e2f47764b9b8afcf8
244 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious intent, including links to algorithmically generated URLs and compromised CMS uploads, as well as a critical ClamAV detection. The document also explicitly instructs the user to disable security software, a strong indicator of malicious activity. The presence of embedded URLs and the overall structure suggest it's designed to lure users into downloading further malicious content, likely a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 9

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://laborke.ru/uplcv?utm_term=iphone+style+call+screen+for+android PDF link annotation
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/161385c70d67a2---zutowiri.pdfIn PDF document text
    • https://vsevolozhsk.mebel18.com/uploads/files/zotorepisidolap.pdfIn PDF document text
    • http://metrominicabs.com/survey/userfiles/files/gebawekopuluxa.pdfIn PDF document text
    • http://aedelsur.com/contenido/files/50519594429.pdfIn PDF document text
    • http://lucidareemantenerepavimentifaidate.it/userfiles/files/sunateberekupufowotaj.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/2969d517839ccff3fb43c96a44ea551c/32355313376.pdfIn PDF document text
    • https://tgvl.in/uploads/fck/files/52797927137.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613497de4412e---72558310247.pdfIn PDF document text
    • https://www.servicespace.org/inc/ckfinder/userfiles/files/goxenolenawizivegul.pdfIn PDF document text
    • http://emilygrilltogo.com/uploads/files/36777499467.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16147bed2f40a3---33699841366.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/d91a53081b92ec37c764e7e88e80ff21/nejuselos.pdfIn PDF document text
    • http://ticketsperiodico.com/galeria/files/72079952883.pdfIn PDF document text
    • https://lexcyberia.com/userfiles/files/33102277061.pdfIn PDF document text
    • https://e-ceramika.pl/userfiles/file/bizifevurekox.pdfIn PDF document text
    • http://yejiya.com/userfiles/file/37317049316.pdfIn PDF document text
    • https://adtw1.com/ckfinder/userfiles/files/donerefegekabowaxudisel.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612eebec73d29---91868937280.pdfIn PDF document text
    • http://remont-etalon.ru/upload/files/70599580298.pdfIn PDF document text
    • https://argumentua.com/i/file/9346291562.pdfIn PDF document text
    • http://hagelkonzept.com/userfiles/file/72788272318.pdfIn PDF document text
    • http://stomerijindex.nl/images/uploads/mobekekuvenapetewiliz.pdfIn PDF document text
    • http://dfanchem.com/upload/files/84469058559.pdfIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/4104a78924d9a2e2087ef0d4865d56d7/nosesagenuzugolexut.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_off0000cf9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF9E 20040 bytes
SHA-256: 3b865fb058e5221f040be874666cc1c9b07989a6fed12b80f116b2d313757ebd
font_01_sfnt_off0001038f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1038F 10784 bytes
SHA-256: d796eb15445254ac34687d3b8fd9c2ee6a86ddbce7305d8a18897edfb2db0c73
font_02_sfnt_off00011c5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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