Malicious PDF — malware analysis report

Static analysis result for SHA-256 33fa3f8ab1a3adc2…

MALICIOUS

PDF

86.7 KB Created: 2021-09-12 06:51:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 45ce249175441070e25b88f222107367 SHA-1: 9d3a834fe45c6b481d40c0898f3a632adbf351e1 SHA-256: 33fa3f8ab1a3adc2b56f457b0740e5eb89b36435213ec88fc55718a32613ec37
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised websites and disposable hosting, indicating a link farm designed to redirect users. The presence of external URIs and link farms suggests an attempt to lead the user to malicious content, likely for phishing or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://yachtandgulet.com/userfiles/file/40729037660.pdf In PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/a8a0e90a06eb0d098b70b115798e6c72/fekugopur.pdfIn PDF document text
    • http://donghobaoan.com/uploads/files/rozerugoxawokiretotozaba.pdfIn PDF document text
    • https://sfeerweter.nl/userfiles/files/53988571774.pdfIn PDF document text
    • http://worldtile.net/jangheung/userfiles/file/wawumomuveti.pdfIn PDF document text
    • http://sun-green.be/ckfinder/userfiles/files/50360367352.pdfIn PDF document text
    • https://agape4u.org/userfiles/file/13275139516.pdfIn PDF document text
    • https://carsen.sk/editor_uploads/system/files/77988075532.pdfIn PDF document text
    • http://yh-nutri.com/filespath/files/20210907061941.pdfIn PDF document text
    • http://duet-czluchow.pl/userfiles/file/zuzum.pdfIn PDF document text
    • http://sntaviator.ru/ckfinder/userfiles/files/juvemupo.pdfIn PDF document text
    • http://www.leasebridge.com/CKUPimg/files/menotorolelumeze.pdfIn PDF document text
    • http://icloudcleaners.com/uploads/account/autoresponderfiles/logujobi.pdfIn PDF document text
    • https://eyescare.vn/app/webroot/upload/ckfinder/files/pemuduguvoxitebemexewuned.pdfIn PDF document text
    • http://fuyu.010bi.com/ckfinder/userfiles/files/panixexe.pdfIn PDF document text
    • https://manhremhoangvan.com/wp-content/uploads/files/bujekapujiw.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16136e477bb729---vetenosidigezugevusiv.pdfIn PDF document text
    • https://thebillionbottom.com/business_school/uploads/file/zilagapojexixi.pdfIn PDF document text
    • http://dh-cell.com/ckfinder/userfiles/files/17604979269.pdfIn PDF document text
    • http://patp1ryb.ru/media/file/ruwusofupipuviwefiwodak.pdfIn PDF document text
    • http://theponghop.com/upload/files/pewagarijexive.pdfIn PDF document text
    • http://terminsk.by/pics/files/wevajewusubunowote.pdfIn PDF document text
    • http://mayinmaunhat.com/upload/files/siliwofanivu.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/0b7227cb8d355ef8791eeab8bd781822/65567892891.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=redmi+note+9+pro+bangladesh+price+unofficialPDF 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_off0000e2ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2AD 11520 bytes
SHA-256: da7407e60dd1f8783763b192f0ba50dbfec39950d66ef03672beef54290212e4
font_01_sfnt_off0000fd5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD5B 20552 bytes
SHA-256: f800ec3978d00e0d8c02f662d9b3137a0378b7c417cc86e11800240058570386
font_02_sfnt_off000132c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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