Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf96d7e65f448c0c…

MALICIOUS

PDF

74.1 KB Created: 2021-09-18 19:43:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fe6159086b469e8bb607540cb745fa08 SHA-1: 27786d8ba94dba12f49486b5a4c93274815a0735 SHA-256: cf96d7e65f448c0c5c348d5e413eb38263e41ffafcf1f445d71fdb561c8873a2
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URIs, many of which point to disposable hosting or compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://wacommerce.net/home/integrity/public_html/ckfinder/userfiles/files/xelinobufurefuv.pdf In PDF document text
    • https://uzunlarpeynir.com/dursun/upload/files/70921256790.pdfIn PDF document text
    • http://aven.su/userfiles/file/7170539091.pdfIn PDF document text
    • http://sskj.pl/userfiles/file/kugemevodolod.pdfIn PDF document text
    • http://chongqinghaohong.com/upload/files/39354789354.pdfIn PDF document text
    • http://holzweiss.at/bidegelifefuka.pdfIn PDF document text
    • https://ratosatu.com/contents/files/makexofajavigigatupo.pdfIn PDF document text
    • https://exam10.menapoint.com/app/webroot/upload/files/76850189951.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/60hmu1240olcqnac4ogs75jg5a/42164450761.pdfIn PDF document text
    • http://178.62.148.222:300/ckeditor/ckfinder/userfiles/files/30713245595.pdfPDF link annotation
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130404c754f2---xitexejarufobironawese.pdfIn PDF document text
    • https://anne-berger.de/sites/anne-berger.de/files/fkcfile/44469494768.pdfIn PDF document text
    • http://nemeckystrakac.sk/editor_uploads/files/68003091739.pdfIn PDF document text
    • http://pb-book.com/user_file/file/83707658249.pdfIn PDF document text
    • https://krantiservice.com/ckfinder/userfiles/files/94334594193.pdfIn PDF document text
    • http://wsm.hk/images/files/91498513967.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161351a2da1f62---16719265787.pdfIn PDF document text
    • http://ytovietnam.net/ckfinder/userfiles/files/zadatoxizoladuver.pdfIn PDF document text
    • http://speckrepej.com/upload/file/xukixowugotekoxitunesu.pdfIn PDF document text
    • http://montpellier-businessplan.com/mbp/upload/images/images/upload/ckfinder/mamejawegovani.pdfIn PDF document text
    • http://permanentnimakeup-brno.cz/userfiles/files/tadolo.pdfIn PDF document text
    • http://lifeline-sports.com/files/file/34038384389.pdfIn PDF document text
    • http://as-eng.biz/userfiles/file/94800701834.pdfIn PDF document text
    • http://statsale.com/data/upload/ck/files/lasosajutitovavog.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/badee10bcbf08c08f74ef8ec56e3efd2/dujuzuzinivi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=mcpe+master+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_off0000bf9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF9F 17276 bytes
SHA-256: 231e6d74c3580625c910f33657a1d649d9e233358edd75140042a5b571eab663
font_01_sfnt_off0000ec38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC38 10260 bytes
SHA-256: 56720f9d85866bd6aa23ef19a45ab53903adf0b7cdedb9340f211984eb09cde4
font_02_sfnt_off00010362.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10362 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1