Malicious PDF — malware analysis report

Static analysis result for SHA-256 b764fa5cf3125bc5…

MALICIOUS

PDF

88.0 KB Created: 2021-07-04 03:49:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ec3388877b1c86e9cb0c0acd0d22a58e SHA-1: 3fe93a5076b43ce73ed06a31b54b1daa48a31c21 SHA-256: b764fa5cf3125bc562f25e0523e760c3c2cf6fd4286bbda6283dc086c580369f
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file that exhibits characteristics of a phishing lure, as indicated by the 'SE_DOWNLOAD_BUTTON' heuristic and numerous links to compromised websites. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the presence of external URIs and the overall structure point towards an attempt to trick the user into downloading a secondary malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://jordanfamilyreunions.com/clients/5/51/51534e3e38036466a76ca8a024fd4923/File/9345770044.pdf
    • http://yasairamenbar.com/uploads/files/90068794344.pdf
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/653d862d2cd475a79e30a14efc6f3813/juwowug.pdf
    • http://tubietelbar.hu/uploadfile/bazuva.pdf
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16081f4727d008---7113745418.pdf
    • http://hongshengfish.com/uploadfiles/2021051222322426972.pdf
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc84d29696---59312851690.pdf
    • https://toskov-yordanov.com/userfiles/file/46619977116.pdf
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160812c0a8492a---33720259189.pdf
    • http://simmsfamilyreunion.com/clients/9/98/98d47f1658d09d39d77ba56043454c9c/File/vomevudorosadif.pdf
    • https://shreenathtechnologies.com/userfiles/file/bizevetu.pdf
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a69004c86e4---zimojivusarogifedarixas.pdf
    • http://tw-sincere.com/upfiles/editor/files/vurixogig.pdf
    • http://shiokuda1.com/contents//files/muwiserebafupubekut.pdf
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/79531db0ed178c7c4028d6628f75d27c/xifixusedidipusarum.pdf
    • http://adveotec.com/img/file/11377513184.pdf
    • http://157.230.241.115/image/upload/File/jafomurigudi.pdf
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/a6a4a4fcaf08e70589909726af8061ad/80493618962.pdf
    • http://shsalumniauditorium.org/clients/f/fa/fa32e32112b7cad64a7d7e78b95ed61b/File/27603130493.pdf
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/co8ea1td24urdaltk12s20v641/82662687874.pdf
    • http://shlawllc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kamujo.pdf
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/16076206aa1c20---52771430802.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=davidson+latest+edition+free+download
    • 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_off0000f4e4.bin
e9ab15b4bfed2b7420f8a902d69c694b0691514509227e6051561401f8ac4f6f
pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E4 10500 bytes
font_01_sfnt_off00010cf8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF8 16792 bytes
font_02_sfnt_off0001250a.bin
0f1039d0225642a1da7185903349ba250bd3406c56701770a8caf7f8c9627bd8
pdf-font-stream PDF embedded font (sfnt) at offset 0x1250A 16964 bytes