Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a555e8bd613d7de…

MALICIOUS

PDF

77.2 KB Created: 2021-09-02 05:49:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6544b91cbe03b23b11d7d1114ad15304 SHA-1: 487c0a0c21eb231f28fdb8c60f26ef65b1fc9b30 SHA-256: 1a555e8bd613d7de3bc7c0cf4738416368da1fd9b66c6965a50f77effdeaca26
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a phishing or spam campaign, primarily through its extensive use of links to external sites. Many of these URLs point to compromised WordPress installations, indicating a tactic to disguise malicious links. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious nature of this file, suggesting it is designed to lure users into clicking on these links, potentially leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://drafthe.ru/uplcv?utm_term=pearson+education+geometry+answers PDF link annotation
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/7a79e231423f70a6417d17f69b6ca1ab/32746341032.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7b22e3dce4---37529056691.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/70811901140.pdfIn PDF document text
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4bdf70c9b---86293044539.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16073067a24ce2---jofudin.pdfIn PDF document text
    • https://kompaspt1.com/contents//files/ledexokozufisolimeburi.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16126d5f2aad47---48661802.pdfIn PDF document text
    • http://vhshf.de/File/mepugem.pdfIn PDF document text
    • http://greece-ex.com/images/blog//file/33393908068.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/v015savkebkdn0o4uf6jba428k/33006779262.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/rerifitizapofugav.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16100534dee5c4---fezev.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c13be800355---xupudovo.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/13368776986.pdfIn PDF document text
    • http://ithaca1960.com/clients/8/87/874e400c25abfb160fd1c0cf9913fcd0/File/bipasarumolujif.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160985cab74063---kezamupomaguterolotemom.pdfIn PDF document text
    • http://szrealty.net/uploadpic/2021-5/file/2021051208042573499.pdfIn PDF document text
    • http://ambulatorioveterinarioilghirlandaio.it/userfiles/files/zarasutuja.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9e43c9bb43---zorejetevutuf.pdfIn PDF document text
    • http://www.toeterloeh44.de/files/790012566.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612c7f3f47e59---13704744509.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/4711283683.pdfIn PDF document text
    • http://kcde.kr/userfiles/file/5164651330.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_off0000cc4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC4A 15608 bytes
SHA-256: 12d6ae414822cdd143795a81aad8859fb56a2611f83b94a57e13717fae99fb35
font_01_sfnt_off0000f4ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010cc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC4 10968 bytes
SHA-256: bae30762e199928eb202979a79b8eadabcabc1de43bb5755a96cf63674a57a2e

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