Malicious PDF — malware analysis report

Static analysis result for SHA-256 afceaef84d9638be…

MALICIOUS

PDF

68.9 KB Created: 2021-09-13 11:44:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: caa0791c206c45b8b80dba9e9119bfb3 SHA-1: 615756557a4ed654d6f1d831a059031b5c5e75a0 SHA-256: afceaef84d9638bea2b4fc550fbe9ac51d26640922be4392f6426a7e18d2b991
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple websites, many of which appear to be compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary purpose seems to be directing users to potentially malicious content hosted on these compromised sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/e5ace83d51e4d5a6b1f55ecda579e2b5/508988442.pdf In PDF document text
    • https://pharma-tools.pl/galeria/file/purapikog.pdfIn PDF document text
    • http://redactron.com/userfiles/file/52305705893.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/87768735550.pdfIn PDF document text
    • http://seattlebestteriyaki.com/uploads/files/44983362084.pdfIn PDF document text
    • http://obchodsezlatem.cz/upload/files/zodobozevuru.pdfIn PDF document text
    • http://hangtatmj.com/userfiles/jopig.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/74443047770.pdfIn PDF document text
    • http://kossuthdigisuli.hu/userfiles/file/galisexivofozuzedudasuzil.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca0dae526d---91391536667.pdfIn PDF document text
    • http://tainghe.vn/userfiles/file/ruxasemujizesoluvanus.pdfIn PDF document text
    • https://snoman.mb.ca/ckfinder/userfiles/files/fozinive.pdfIn PDF document text
    • http://mayepnuocmia.vn/data/ckfinder/files/nagimefug.pdfIn PDF document text
    • http://templeton.sk/userfiles/file/37483356226.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613389ec6c26c---56563537255.pdfIn PDF document text
    • http://www.dean-cpa.com/files/adminpic/file/24130675592.pdfIn PDF document text
    • https://www.singaporemedicalclinic.com/ckfinder/userfiles/files/sudejamije.pdfIn PDF document text
    • https://xn--espaoldetalca-lkb.cl/var/www/html/upload/file/dirikumewedawezinag.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/bca04f49716973e43fea3c603fb6f4a9/69640196228.pdfIn PDF document text
    • https://eccdc.org/application/webroot/userfiles/file/tebetafotor.pdfIn PDF document text
    • http://heibldr.hu/FCKfeltoltott/file/lenoligakufemiwebuwuvo.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16138b65fd6147---giwedakekalonelerelufara.pdfIn PDF document text
    • https://asztromiskolc.hu/ckfinder/userfiles/files/vizosukomo.pdfIn PDF document text
    • http://shiokuda1.com/contents/files/82375941390.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d4d6ecc5ea---norigotitepovexegixugafo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+download+iphone+ringtone+on+androidPDF 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_off0000b1b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9CE 10580 bytes
SHA-256: 64463365671b07957fa8589d3400f04eb6ca9b147ee6f6f9c96c00189fcae1d1
font_02_sfnt_off0000e19d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE19D 14516 bytes
SHA-256: 311aa5a833469d2830451c70b48c931cee33ad4475fe9d0b12595d53a972fdbd