Malicious PDF — malware analysis report

Static analysis result for SHA-256 fddeb790a7c2530a…

MALICIOUS

PDF

90.9 KB Created: 2021-09-09 23:25:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 657b1f190edc19ca6642efd1fa8f2a70 SHA-1: 733040228f7ed358f784502ba3988781ea0c40fe SHA-256: fddeb790a7c2530a6c4e153c8637d0ccdbf49e19349e013f873b4cc0d1270179
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 6

  • 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.
  • 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://abcbyspu.net/ckfinder/images_store/files/kenopugas.pdf In PDF document text
    • http://ersenergy.com/UserFiles/file/gugomelagevagekadugig.pdfIn PDF document text
    • http://elcwma.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/37176352783.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136cda77116e---79012157428.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16133c104815f8---44191430687.pdfIn PDF document text
    • https://777mto.info/contents/files/32289588960.pdfIn PDF document text
    • http://casaatlantida.com/userfiles/file///ruwakobilukuxutofu.pdfIn PDF document text
    • https://gangnampools.com/contents/files/39556761815.pdfIn PDF document text
    • http://contelex.it/userfiles/files/pobawanopiviwilinuzib.pdfIn PDF document text
    • https://chennothinterios.com/uploads/file/85273981955.pdfIn PDF document text
    • http://chongthamphucthang.com/images/news/files/suwolawonekudozowexonada.pdfIn PDF document text
    • http://jualumnitoronto.com/editor/uploadfiles/sopolikotuboruwewalorop.pdfIn PDF document text
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/66082798361.pdfIn PDF document text
    • https://www.tahitotfalu.hu/ckfinder/userfiles/files/38039681786.pdfIn PDF document text
    • https://stdtekstil.com/upload/ckfinder/files/55511347860.pdfIn PDF document text
    • http://phunphu.com/userfiles/file/jevakasafotu.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/2012ee53644f068ba2061004d91cd5f6/vumudur.pdfIn PDF document text
    • http://jca-t.com/fck_image/file/mujaxilafubibivabub.pdfIn PDF document text
    • http://www.ctmmaximoravenna.com/ckfinder/userfiles/files/7006104894.pdfIn PDF document text
    • http://balbu.eu/uploads/news/file/5027073822.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/55633618279.pdfIn PDF document text
    • http://quangcaosms.org/media/ftp/file/miditawususitolefeni.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=love+in+the+time+of+cholera+full+moviePDF link annotation
    • https://lapdonline.org/file/kapakabaxibedudibutevim.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_off0000f931.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF931 10556 bytes
SHA-256: 3dde65f0e8c54982b6ddd4c33756c14cc6ce43373b7adaa2d96c1f1d4cb36475
font_01_sfnt_off00011104.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11104 19988 bytes
SHA-256: a5be1b2017ca4241212e9bdaf71534603173d1423f45d7e2e3ae01ca054ce617
font_02_sfnt_off000145cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1