Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b7beee7037659f2…

MALICIOUS

PDF

84.7 KB Created: 2021-09-09 14:04:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5ef460c934bd60fcaf85477931669ffc SHA-1: eb760b4afc4d31dacf04502fad19b11bcbe9015e SHA-256: 3b7beee7037659f2f3e3428d10add84a20034b9ec4ce0df6b897d7beb04e915b
164 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics indicate the document functions as a link farm, with many URLs pointing to potentially compromised or disposable hosting, suggesting an attempt to distribute malware or phish for information. The presence of a 'download button' lure further supports this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • 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 http://dealershop.es/userfiles/file/fudazipumogufenuwimunalo.pdf In PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef0d5864df---70508825235.pdfIn PDF document text
    • http://www.clc-engineering.com/siteuploads/editorimg/file/sirukobefodadunimog.pdfIn PDF document text
    • http://alhambra.kopanramen.com/uploads/files/tagenoj.pdfIn PDF document text
    • http://solo-reisen.com/media/images/file/bogutogilitovusejuvidox.pdfIn PDF document text
    • http://bronnicy.inhome360.ru/admin/ckfinder/userfiles/files/livivebikizilos.pdfIn PDF document text
    • http://assytekservizi.com/userfiles/files/sufosasofizitirakud.pdfIn PDF document text
    • http://ijfbn.com/editor_up/pufewasovorejaxet.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136d3157a20a---weninatawagepirifi.pdfIn PDF document text
    • http://crystal-lamp.ru/uploads/files/21103598160.pdfIn PDF document text
    • https://shopexpert.com/app/webroot/files/userfiles/files/xifadawopulibaso.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/ba84d11ac842be1efedc0010f3d36ac0/9934340728.pdfIn PDF document text
    • http://kyochonbuenapark.iorderfoods.com/uploads/files/voxebokorigagafifimef.pdfIn PDF document text
    • http://scro.ru/pic/file/91747360404.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613971236e129---bexowubuxatavoxigeges.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137dfe51b583---dilelemotovipezozolim.pdfIn PDF document text
    • http://pandoraecza.com/genelresimler/file/vifenoditaminupitiw.pdfIn PDF document text
    • http://zerosquareonline.com/file/74047154478.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/af19a40af6553acf900a36c1eb71cc11/jetagavepa.pdfIn PDF document text
    • http://hoteldarim.ir/basefile/hoteldarimir/files/zutizamadid.pdfIn PDF document text
    • https://www.cosanuesa.com/componentes/editor/ckfinder/userfiles/files/34360672005.pdfIn PDF document text
    • https://yunglin.com/uploadpic/files/47795581692.pdfIn PDF document text
    • http://studiotecnicofrisoli.com/userfiles/files/47856063707.pdfIn PDF document text
    • https://handinhand-daycare.com/ckfinder/userfiles/files/rofivatirotageso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=stealth+master+ninja+killer+mod+apkPDF 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_off0000e274.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE274 10956 bytes
SHA-256: 25c08aed5235812f721bfed82a5592df34a4c2db9d75a77b842d3903db3b2723
font_01_sfnt_off0000fb8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001139f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1139F 18976 bytes
SHA-256: dd15b2667230e654af0592e45646233d9df0b6485a3d3e16d8d6fc300a3abc78