Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4d848bda6a8897c…

MALICIOUS

PDF

78.5 KB Created: 2021-09-08 02:54:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0689d5568eea1876dbcb9560abf4e219 SHA-1: 4291ad9db2b78551991dc3b95f809188ec42797a SHA-256: d4d848bda6a8897cebc6b0d0031a8cca94e4f75956c01deed2d1a700af96556f
164 Risk Score

Malware Insights

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

The PDF was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The document contains numerous links hosted on compromised CMS uploads, suggesting a phishing or malware distribution scheme. The presence of a 'download button' heuristic further supports the attack pattern of luring users to download a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/c8970e734ab43d6bcb3727954958b773/telemovapekifarovebu.pdf In PDF document text
    • https://salubrismd.com/wp-content/plugins/super-forms/uploads/php/files/001026319d9749a41d03f98956c77387/gijewigagebewejurakosize.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085607b16fd7---bawejidusaruvewirit.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/55585040433.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/zapatefemiwigukoxib.pdfIn PDF document text
    • https://www.q-jin.ne.jp/ckfinder/userfiles/files/bukoxod.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613518abd23b7---43685233096.pdfIn PDF document text
    • http://rw-hse-businessconsulting.de/userfiles/file/gonexotemebizesitadubog.pdfIn PDF document text
    • http://wxeina.com/userfiles/files/22130951021.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093a80b4318f---55825418532.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/varurigogawategipe.pdfIn PDF document text
    • http://ahhsclassof1980reunion.com/clients/e/eb/eb0bda5e83c72ae03ef0bdd1ae4752ba/File/navurawofelujozamipix.pdfIn PDF document text
    • https://tungafilm.com/dorceiys/ckfinder/userfiles/files/77972450551.pdfIn PDF document text
    • http://hc6999.com/userfiles/files/33223672503.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/ffe57b91913de915bad58d1b4c586806/funipe.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/xufafavesezametulaxaz.pdfIn PDF document text
    • http://kaowei.tw/image/files/20210529_083158.pdfIn PDF document text
    • http://steelfurniturecn.com/d/files/pebuvobaziribebiruwobizo.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/35255806911.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613431fca3ee5---gomerigaluzijenuvugokala.pdfIn PDF document text
    • http://gandolfiarchitetti.com/userfiles/files/tixar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=convertir+de+word+a+pdf+gratis+y+facilPDF 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_off0000cd6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD6E 11092 bytes
SHA-256: 83f994ac369302bd9c5873b7c52b60b462a258580eca6ad0d85917f1044126be
font_01_sfnt_off0000e75b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE75B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF6D 17396 bytes
SHA-256: 53dcf831faccb8b9a151484a70589f85f5d41401120019a9eb989ba6ee422f76