Malicious PDF — malware analysis report

Static analysis result for SHA-256 16ce1ea737726a82…

MALICIOUS

PDF

78.6 KB Created: 2021-09-01 01:34:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 5468574e1a14f8d6781255a0204ce996 SHA-1: 1d374e28f0169a19c300d7a16889e80fce8f7c08 SHA-256: 16ce1ea737726a82b1c45c0e048c4b7817d35b8542c45f2e77277ea57585e3b2
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is flagged as a link farm, with several links pointing to compromised WordPress uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware through these links. No scripts were extracted, and the document body was unreadable, so the rationale is based on the heuristics and URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://allytemp.ru/uplcv?utm_term=self+motivation+quotes+in+english PDF link annotation
    • https://thuaphatlaihoanghuy.com/uploads/files/29467086964.pdfIn PDF document text
    • http://terhautz.com/upload_files/files/1349741914.pdfIn PDF document text
    • https://gmt-tw.com/app/webroot/userfiles/files/lowiwewupujol.pdfIn PDF document text
    • https://btsis.com/upload/ckfinder/files/26913677585.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/7pahh0r3mtdukttsr1brff5nfr/nimaxolere.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/luwakotabizibafuvuzamor.pdfIn PDF document text
    • http://evopizza.lt/ckfinder/userfiles/files/29879356357.pdfIn PDF document text
    • https://bnbcostaverde.it/userfiles/file/zuguvulawosot.pdfIn PDF document text
    • http://placc.info/up_image/jejajubipekozejejezalipav.pdfIn PDF document text
    • http://bsa.by/ckfinder/userfiles/files/zibepobudupezugagidejari.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/95427130940.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16081c22fa3b38---wewafijorujedusixonunavim.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/ofpk0v9jtvhnv79q513otsbeh6/jazexekukowu.pdfIn PDF document text
    • https://hantverksakuten.se/ckfinder/userfiles/files/pamosonemo.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4ac089934---ruwemos.pdfIn PDF document text
    • https://sapporomn.com/userfiles/files/junujekexezorexovu.pdfIn PDF document text
    • http://seksdagen.nl/userfiles/file/vigigirumalatabowowiselo.pdfIn PDF document text
    • https://amgaa.org/temp//files/37873222787.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/zewutozewexifezovadojep.pdfIn PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/kejuzefamatupus.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608256c4543a0---71073508627.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc12109a679---malazimogejekojisuroxoguw.pdfIn PDF document text
    • http://tce.vn/imagesflashupload/file/duwowupoxa.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_off0000cdd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDD7 17424 bytes
SHA-256: de50d9a9d336fba158fd4cc3a9c93ab40e14141fb6297d8cefa3e4c4d246d3eb
font_01_sfnt_off0000faef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAEF 10948 bytes
SHA-256: 791c6fd59cff6eae59df27fb645a7629000355a1ff0250c86f84346308b362fa
font_02_sfnt_off000113d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.