Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4511fa8866aa1e6…

MALICIOUS

PDF

89.5 KB Created: 2021-06-27 07:16:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4b4a5d51447cd9853fbb0b916c23c956 SHA-1: bb9eca23a82c92e0bd4acc830014f3626100fd45 SHA-256: c4511fa8866aa1e6fb23f9d944f76307034b9b03437ae4053cb6d97157303421
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs, such as http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb74e2c19c---regenepojezuganilo.pdf, are likely used to host malicious payloads or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/160a7d03e4fee3---51783775122.pdf
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb74e2c19c---regenepojezuganilo.pdf
    • http://marathon-gexin.com/Uploadfiles/files/32642392079.pdf
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/hn92p0d39boa3b4aaladlk4uu6/likojex.pdf
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/a25b4a2bf1188a2bf479c2e05af4f147/64533743538.pdf
    • http://richmediahouse.com/admin/uploads/file/fakofolebudulupulira.pdf
    • http://boxerdapolenta.com/cmsimple/images/file/raboviwowofipewiwijotem.pdf
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/019d2eef9dc0e1b1073ada17ee74d854/14684860344.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6190cbea6---zalupasojumapulipefed.pdf
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/e9rg2t1dp1c6tjk6v200f9ngtc/bexawes.pdf
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/avpba52haf6c7t7jbspm6vs962/jexaboxusojevovon.pdf
    • http://serramentisiciliano.it/userfiles/files/79439545159.pdf
    • http://j-club.eu/userfiles/file/vakuru.pdf
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a50b1dd1d4a---74742181051.pdf
    • http://www.bluewhaleline.com/image/upload/File/87051312980.pdf
    • http://wjvanderheidedienstverlening.nl/uploads/file/simivuwa.pdf
    • http://flagrant-desir.com/userfiles/file/berafa.pdf
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074221f72007---popikisix.pdf
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/238hi6b8724i9fh2mge9ntumt1/ranewonolabuforage.pdf
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609a045d2ba42---gerudawivutiwu.pdf
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/16205853342.pdf
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092044908637---90948565931.pdf
    • https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/beklaemamd2o5gme8p45hg216u/75034017693.pdf
    • http://okmarin.ru/userfiles/file/wiresebuwap.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=template+for+persuasive+essay
    • 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_off0000fcf1.bin
07f6dcfb592d27b6e2061131cb8e9f2d0342af39879d0e2c3064ab56a3d68a20
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF1 16620 bytes
font_01_sfnt_off00012810.bin
a25470c9e1f3b16f1517455a75c76883ff24bfd2e0eb265d38835b558b293def
pdf-font-stream PDF embedded font (sfnt) at offset 0x12810 10656 bytes
font_02_sfnt_off00014089.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14089 16792 bytes