Malicious PDF — malware analysis report

Static analysis result for SHA-256 035d3f24bb0824ae…

MALICIOUS

PDF

80.3 KB Created: 2021-06-27 03:29:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0923897556c9f39b74a99751b71f37db SHA-1: a55f55496e13fd4eb2e3a3402bd424abc51d6cee SHA-256: 035d3f24bb0824ae02ca72b5916f89d787d4a62225f3f84dd6c0ef0440d1fe50
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The primary attack pattern involves directing users to download further malicious content from these compromised hosts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 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 http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3405a58e09---fumiwenuwaw.pdf
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af6e304f4c3---66035439684.pdf
    • http://ozari-ua.com/files/file/46041453797.pdf
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/16093a0064bd8b---47600700187.pdf
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073208ca4b7b---tejofeka.pdf
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/luk3r7rfvpb46vlci6in0ooe2l/23821449160.pdf
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc590dd02a---boxadezujekep.pdf
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/9gr2u6mrrb6otg113kipnf98ms/tefuxakelexuwubisavaka.pdf
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/1t3l6us78aq72j90hr466hi212/49836770500.pdf
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/uav5f63bh4e9ap6vuqfvf34llc/fojubopivisuworabomuxeres.pdf
    • https://hostingyuvasi.com/calisma2/files/uploads/pamosiderojisubam.pdf
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb04c973ff2---kaxof.pdf
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/tebbmbic6bhcomtseroa3ta8k3/50188270538.pdf
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160892ac05f468---64606629714.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3e37caf81---nojumikafajedebepibaned.pdf
    • http://agcslohian.com/userfiles/file/13196217574.pdf
    • http://asbazainville.org/userfiles/file/xuxewerovajezi.pdf
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/9ea4b14e65f4f8e808aac0e194fdb9e1/60074131717.pdf
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/160857a43c6b5d---70358027755.pdf
    • http://automsystem.com/UploadFile/file/20210627060456520.pdf
    • https://geneolock.com/locktactyuma/userfiles/file/mugitenarupaf.pdf
    • http://phunggia.biz/userfiles/file/xepugigixefezi.pdf
    • https://napraforgohotel.hu/upload/file/28850779219.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=introduction+to+classical+mechanics+morin
    • 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_off0000d8c2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C2 16792 bytes
font_01_sfnt_off0000f0d9.bin
5e83973d4f93d8a01dccf3445854244caa0605a873c691e949d6f0d54fc4e0db
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D9 10684 bytes
font_02_sfnt_off00010923.bin
a8d3fd2de68daacb271275b63b352e766ab92169648197e0ca3359b68b6fe34c
pdf-font-stream PDF embedded font (sfnt) at offset 0x10923 16504 bytes