Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcdc60df784f8228…

MALICIOUS

PDF

69.2 KB Created: 2021-09-29 12:05:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7875bb42df16598107d780cc8ae0e1da SHA-1: 255a972f5b14a5bb9e0d375556adae052b5bb883 SHA-256: dcdc60df784f8228440acff9752590ee05e01270ac5b067b686d3c1520a284d9
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF employs an image-only lure, a common phishing tactic, to entice users into clicking embedded links. Multiple heuristics indicate a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://akgwealthplanner.com/crm/files/luwafidesavimagujulejig.pdf In PDF document text
    • https://tecnicadovolante.com/images/file/28489946836.pdfIn PDF document text
    • http://majedalkarkhi.com/pics/file/refiveboniwadeporanilesa.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/979oijs8a5qaip2i4isfstuau2/98603698336.pdfIn PDF document text
    • https://fokusmedia.com/images/uploads/jukag.pdfIn PDF document text
    • http://cwpni.com/userData/ebizro_board/file/dezakasuwadinabeg.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/8iq7a8dvk7s9vrrft4lmpvuj1q/82612297104.pdfIn PDF document text
    • https://mldom.xyz/web/img/podborky/files/1199415392.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/20369120159.pdfIn PDF document text
    • http://miskolciharsona.hu/pictures/file/dogelunogako.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/161496e9eb3806---62589588518.pdfIn PDF document text
    • http://myphamso1.net/uploads/files/nunavewogazalebere.pdfIn PDF document text
    • http://kpdb.org/userfiles/files/47442385054.pdfIn PDF document text
    • https://laatjehuisweerstralen.nl/upload/file/9624681319.pdfIn PDF document text
    • http://123flower.doweb.kr/upload/files/78687416488.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/1078527211614f3c2693564.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/80788995205.pdfIn PDF document text
    • http://ensky-chemical.com/upload/files/77750806969.pdfIn PDF document text
    • http://mstreatmentadvances.com/userfiles/files/33197179058.pdfIn PDF document text
    • https://kaplaitalia.it/userfiles/files/finedulavejido.pdfIn PDF document text
    • https://signatureshreyas.in/userfiles/file/gozuvi.pdfIn PDF document text
    • http://peter-scherer.de/userfiles/file/114356634.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/38486150921.pdfIn PDF document text
    • https://observatoire-omic.org/documents/file/9648214417.pdfIn PDF document text
    • http://www.novosib-sport.ru/ckfinder/userfiles/files/vonivoloxemuweki.pdfIn PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/22517394274.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=battle+beach+mod+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_off0000b491.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB491 13880 bytes
SHA-256: 11e3fb904fbb2cef7517a62b743998a9f4eaca5dbaad0b8281c2da961eaa5765
font_01_sfnt_off0000d728.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD728 10600 bytes
SHA-256: c549cc0e44295bcbb8f44cb7d39a399c435458e9bf956894817bb22a42dd9cc2
font_02_sfnt_off0000ef32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1