Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1ce28d25b1d857a…

MALICIOUS

PDF

85.5 KB Created: 2021-06-28 09:46:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9c28dfb932291b209b15001fcd037292 SHA-1: 00696c64faf903845838f9dd1f1d457635f7f86a SHA-256: d1ce28d25b1d857a9533b5c6023db6d35ac043c5e3dc87993cb1b405d801e9b8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious files. The presence of a 'download button' heuristic and the ML classifier's high confidence score further support a malicious classification. Although no scripts were directly extracted, the PDF structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1314b9c69a---14422496026.pdf
    • https://tenshinorchids.com/FCKeditor_upload/file/risukanixosabavuke.pdf
    • http://artgraf24.pl/userfiles/file/dixuzixetafowalodav.pdf
    • http://hungbuloon.com/media/ftp/file/91722716701.pdf
    • http://cbcom.eu/ressource/site-image/files/vezajalulo.pdf
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/89894a8ff1d833611f3f70c2ee924d1b/93057850419.pdf
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/duu697b1du3077fggvlf5g71mu/48786489427.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a91cf949bc4---fidokuxixiga.pdf
    • https://deesudcoolingtower.com/userfiles/file/65932516466.pdf
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac882a763bd---fonepixulifawebanare.pdf
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16090bb87af023---38548090270.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a715ecd2f8b---dewuminisadegozetasesejo.pdf
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/8f1fd349051d057dca51725aac57e70e/90864360194.pdf
    • http://better-pharma.com/images/file/files/satowotafuboziru.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/16cqc2bosrvt4n0rd5p1av64r2/3800550355.pdf
    • http://suachuathietbi.com/upload/files/vuginomarulaxapefilos.pdf
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608febe5799d6---bupufafamanepazan.pdf
    • https://drlanda.hu/user/file/62085300965.pdf
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/jkr5eir3sd3bn1c8u34g2b8bpd/fapigemetujisuma.pdf
    • http://kozelskadm.ru/files/uploads/files/tarapov.pdf
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160b8a652ce763---84029766218.pdf
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160c94e5069ea8---87807503936.pdf
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/06dc1de732e04febd243f58cd81bbea1/wopivawumudarez.pdf
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087e913eb620---molivazejososadu.pdf
    • http://coyada.com/up_images/up_images/pamemiruta.pdf
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160884e7a16bdf---95423773550.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=logo+transition+after+effects+template+free
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9b6.bin
4429d64e83356c938a587c5ca85e52c363a71a6605a2418629ead78de51d9db7
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B6 10780 bytes
font_01_sfnt_off00010288.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10288 16792 bytes
font_02_sfnt_off00011a9a.bin
c5414ea3ba0704f26a94e047b34d7d3bcdf791def613aca590bf4b1955e8449b
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A9A 16812 bytes