Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3e8944706fc4aa7…

MALICIOUS

PDF

99.7 KB Created: 2021-09-02 04:56:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6dd5e08ce96a6d5e756da57ec780fb50 SHA-1: feee769cfe6606ac63fc156c92ecd46176677b52 SHA-256: d3e8944706fc4aa7a60c8e18361125816e576a9bbd8411a7ef173cad8051806d
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload directories. This suggests the document is designed to lead users to malicious content hosted on these compromised sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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 https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/21810f7fee3a4dbc23539110a67ef0c4/lajebe.pdf
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1607cadd4ecb13---68754051204.pdf
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/ai6m99mmcnk8bks1oaon46lbq9/dedeserigalepupub.pdf
    • http://ritadas.in/userfiles/file/puvubuva.pdf
    • http://redigonda.it/userfiles/files/vuwabozigimaduxobogevibe.pdf
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16071f7dec6f71---kopavidoziwomab.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/8bh2ca5h8cb833pdiq3q0vq076/nusini.pdf
    • http://intersonik.eu/upload/files/kidovakijibesojig.pdf
    • http://eng.sut.ac.th/tce/2016/administrator/ckfinder/userfiles/files/kaxivepokamimozojotiw.pdf
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073205956d13---niwomu.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5d7bb64a4---30104588034.pdf
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/d3adf912d48ae0833e9c043b02f9fa3e/wazokimux.pdf
    • http://web300k.com/upload/ck/files/fepuwidugadavajen.pdf
    • http://gatewayhotelbangkok.com/upfile_hotel/files/11777283951.pdf
    • http://wych123.com/upload/files/41422433450.pdf
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16097de68cfa5a---50356838900.pdf
    • http://hz-kontejnery.cz/ckfinder/userfiles/files/57100031525.pdf
    • http://phuwangnam.com/user_file/file/lupek.pdf
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16112aae40069b---74608280056.pdf
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a99b38c1c99---72504906524.pdf
    • http://happinessgown.com/upload/users/files/xiwebisodelefumude.pdf
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16086cac12f31e---ganidigodazigoza.pdf
    • https://nacionalequipamentos.com/ckeditor/uploads/files/wanilukek.pdf
    • http://marcelponjee.nl/ponjeefiles/file/resar.pdf
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/96c2a4584e8acbdca3acfce3a4c535f6/wiruxukifuvokulaxamasup.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=a+hitchhiker%27s+guide+to+the+galaxy+summary
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/f6a09af4e4a0a60552a3bb8705706e05/12581988280.pdf
    • 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_off00011fbc.bin
4b97725ea911a9495eaa3153adf3bc19c710986d8fb5364717252b63531fe41b
pdf-font-stream PDF embedded font (sfnt) at offset 0x11FBC 11136 bytes
font_01_sfnt_off000139b4.bin
c752d68d03b701b4042420b5d437f29224cd0c59e3f7c37fa7722fcfdd5642fa
pdf-font-stream PDF embedded font (sfnt) at offset 0x139B4 17956 bytes
font_02_sfnt_off00016830.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x16830 16792 bytes