Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecbf146027901a63…

MALICIOUS

PDF

76.2 KB Created: 2021-09-14 07:10:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7e23d23b5f67be64ea462ef2cf112e93 SHA-1: d9d421af26f5f49679af675a7e1140c235661b25 SHA-256: ecbf146027901a63c031a45c332d2823609071a5ea19fc2fd377b0491c5bc51e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains embedded JavaScript and a link farm pointing to multiple domains, some of which are hosted on compromised CMS uploads or disposable hosting. These elements suggest the PDF is designed to lure users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://laborke.ru/uplcv?utm_term=kmplayer+apk+for+windows+7 PDF link annotation
    • http://g-shocktou.com/user_file/file/totunabilenoveru.pdfIn PDF document text
    • https://sofupingame.com/calisma2/files/uploads/ralugadirojipapokebimema.pdfIn PDF document text
    • http://vamaconsulting.sk/userfiles/file/zurupijubare.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/9a5b33d673bd9a25b869903a3140931a/7397735390.pdfIn PDF document text
    • https://linlinline.biz/js/ckfinder/userfiles/files/jawefeworojixabo.pdfIn PDF document text
    • https://connatlas.com/home/conn/public_html/ckfinder/userfiles/files/siluzaz.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/6ddde0d83746450c767d989095eca342/pixezokilonare.pdfIn PDF document text
    • http://songdolandmarkcity.com/userfiles/file/7385865496.pdfIn PDF document text
    • http://op-gold.com/ck_image/files/28727392729.pdfIn PDF document text
    • http://soepcentrale-dekeyser.be/userfiles/file/xaguvubogo.pdfIn PDF document text
    • http://vallovin.it/userfiles/files/43123033508.pdfIn PDF document text
    • https://www.southdownscellars.co.uk/ckfinder/userfiles/files/26251176700.pdfIn PDF document text
    • http://huemin.com/fckeditor/userfiles/file/25228351289.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/losoj.pdfIn PDF document text
    • http://robbes.nl/media/files/36180796605.pdfIn PDF document text
    • https://fajanav.com/aym_image/files/kebaluwefivilen.pdfIn PDF document text
    • http://olympicburger1988.com/uploads/files/16882439783.pdfIn PDF document text
    • http://archidaldegan.eu/userfiles/files/27483699391.pdfIn PDF document text
    • https://bunianco.com/other_files/File/lademogo.pdfIn PDF document text
    • http://psn-monolit.ru/img_file/files/42897530364.pdfIn PDF document text
    • http://jedwines.com/cmsCart/upload/file/guladuzitagumovapip.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/79fcc6c68c5f03e536a3e372772564d6/30345873844.pdfIn PDF document text
    • https://betsin.org/userfiles/files/35429915045.pdfIn PDF document text
    • https://zahrek.com/userfiles/file/57728501671.pdfIn PDF document text
    • http://pegasomeeting.medcoast.net/ckfinder/userfiles/files/8819156564.pdfIn PDF document text
    • https://webtechnocrats.com/upload/file/14600048872.pdfIn PDF document text
    • http://kleinschadenexpert.com/userfiles/file/1193752792.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_off0000c2c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2C1 10892 bytes
SHA-256: 529889014fd58dbd2e774b5ce7911e38a5bfb2a6203b7aa87cd965fdd0446102
font_01_sfnt_off0000dc02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f414.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF414 17816 bytes
SHA-256: be498fbd1fb74aff6d9f898f2925fad0d343960afb08fe96d0309c1d5abf9678