Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bb1550128fec23e…

MALICIOUS

PDF

87.8 KB Created: 2021-07-18 00:48:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 99395b504266f0c5bbbe6980bf9edecb SHA-1: 452f051cd7a031aff05ecff4b9b3c31ec93a91df SHA-256: 2bb1550128fec23e155f89f9532d2bdfe60134b46b08f030c227de75ee3638e2
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, indicating a high likelihood of malicious intent. The heuristics identified the document as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting it's designed to redirect users to malicious sites. The embedded URLs, such as the one hosted on 'asu.com.vn', are likely part of this redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • 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 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://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/08isd9el36c1b8n4pviutlablc/33522828475.pdf
    • http://icmasistemas.com/userfiles/files/vokow.pdf
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/5a55430c4f33107ba6db6a5f0a307c99/17846210796.pdf
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160bf929671364---butis.pdf
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080579f29228---22982132676.pdf
    • http://rustproofingottawa.com/userfiles/file/nejakazegofipus.pdf
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bb5cb86a64---96409500828.pdf
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/8e627f08ccd1301b3ec90c0c9a5ca03f/56516001130.pdf
    • http://vejwun.cz/images/93023022528.pdf
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/3966c4875d4d23a2243a92e8bba4df66/wupen.pdf
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/de8b920666b40e6af02ec75d3267f05f/53033025082.pdf
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/virawuxiv.pdf
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/2a99c0eb03d8592955d8ce41fdf50238/25288966190.pdf
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/c9bc85f67b77ff5a31970d0e8d6d2e89/56030212488.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/b74fb3e1184c2e28bc71fc2739025260/51763081788.pdf
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a76448510c---jepekuvanekar.pdf
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/fc4f85acfdc9e3b80dacc52dcd265f10/xuxatozo.pdf
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/25it9ii5e3p75sibp0dmjm09m3/doxasutinudusomokadamigas.pdf
    • http://ledseoul.com/userData/board/file/14524994056.pdf
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/2c7636cf5964059932ebc074d16cce10/jadekogosa.pdf
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160be517ae918b---bedawekumu.pdf
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/16079ce3443306---badet.pdf
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba005f39681---7071286243.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=different+types+of+microscope+and+their+principles+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_off0000f486.bin
7a206cbae236d61b34f6872b6197c725e258c35d3e12e6afc8e7a1e545231b4c
pdf-font-stream PDF embedded font (sfnt) at offset 0xF486 16704 bytes
font_01_sfnt_off00012011.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12011 16792 bytes
font_02_sfnt_off00013828.bin
6ac9c5259135a2ef404f6843797d0c3935aec7ad732af01dcddc8b0989d0b04a
pdf-font-stream PDF embedded font (sfnt) at offset 0x13828 11000 bytes