Malicious PDF — malware analysis report

Static analysis result for SHA-256 be916274337c7bf5…

MALICIOUS

PDF

99.5 KB Created: 2021-07-04 19:57:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 23d8d51e800915c49230a863198a4a3c SHA-1: 2541048136716d7fecc15b102ffb92ce23693aa5 SHA-256: be916274337c7bf50150350dee97ea0bc3078403fcce0aa06ffc6f5bbca9a76f
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and exhibits characteristics of a phishing or malware distribution lure. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting an attempt to redirect users to malicious content. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160794f2a799a6---lovevojoji.pdf
    • https://virtualpulse.eu/UserFiles/file/58416267138.pdf
    • https://vivaldiroberto.com/img/files/mediafiles/file/28053682376.pdf
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b1d4658a4d0---wudulono.pdf
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/gtq6l3gpe00oui1gue5ghe128o/zaxuzulosuzasis.pdf
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082b6c37f83d---97922935509.pdf
    • http://come2menorca.com/images/file/visuluven.pdf
    • http://inlygiaylynhua.com/upload/files/tufomizer.pdf
    • http://progfin.pl/userfiles/file/1946583288.pdf
    • http://cnc-soustruzeni.cz/files/file/14587747024.pdf
    • http://anhuishangbiao.com/upload_fck/file/2021-5-2/20210502090349909985.pdf
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16071c17f7f6df---7781501809.pdf
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/ea1393919c84d889edc6baf30e3fa239/ponafekametafogigopave.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609efab88582a---gifanufozosokadipizom.pdf
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/c3d6128c2a55262a9e0b449e4381af0b/61780530132.pdf
    • https://n-v-v.dk/userfiles/file/zenetosowemi.pdf
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/6721845c4f3d058f4bf0bd7daa12bd8e/43690969540.pdf
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c9346d7ae94---20894306113.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/84v28i9ojlaluraa2bft7ka1p6/95798687842.pdf
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/fdd69a6c8b42d7d1600dd13ed2757d85/wafenusukuzijabimitoduxi.pdf
    • http://bitite.lv/media/txt/122/file/xibokusofesenerafebezi.pdf
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b431e5cccc---21722766518.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=tequila+rum+cocktail
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010861.bin
20aff15fe76d774e25d2ccea65d22a973e4daf9157d361346f75a7aaf20f1782		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10861 19324 bytes
font_01_sfnt_off00013ad6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13AD6 16792 bytes
font_02_sfnt_off000152ed.bin
8df0e3c8e0a8226f12ec7291bb02ae92508f639293e453785c88b473153ab024		 pdf-font-stream PDF embedded font (sfnt) at offset 0x152ED 10420 bytes
font_03_sfnt_off00016a8c.bin
7d15b2d6d265aaca51dda18faee70a1b8fa9d95ed54cb111fb0895789092f9ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16A8C 16312 bytes

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