Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd8de43f170bde75…

MALICIOUS

PDF

85.4 KB Created: 2021-07-14 06:41:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8cff31077697daea5ef23b36a9965185 SHA-1: 9690501cc3423f4b31a3797637910bbe7d7a471f SHA-256: fd8de43f170bde75e1cf59d3c17c16385ea81070225de957258d5da9b1b1027c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing campaigns that often leverage embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b43bcba70c0---69276912075.pdf
    • http://trunglam.vn/uploads/userfiles/file/44865532290.pdf
    • https://baoyi-chuck.com/ckfinder/userfiles/files/pidudanoxokeripoxekapaxa.pdf
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/c0df21faf966af1c3e8f3903f56fbae7/ditaxokokagebaderaresiju.pdf
    • http://plnjl.com/userfiles/files/seriborusixagojurolovi.pdf
    • http://klpa.net/userData/board/file/tuzonapakokemanexedet.pdf
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jovaniwizudepep.pdf
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/d9210661edb41d1d1e8dd684b7939925/59495786819.pdf
    • http://envigest.cz/upload/file/pipud.pdf
    • http://inter-travel.hu/_user/file/megerajuniripik.pdf
    • https://stopserv.ru/files/file/5186447781.pdf
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/f35e9e8f19e4a39543b85e2ecb940f5f/rikivivodexexe.pdf
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607bc47400250---39065091010.pdf
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160e695624260a---25431792532.pdf
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d269184cda---wadekinezewolaxuvetosime.pdf
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae5b3293ad---wodexidixupa.pdf
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078f1f2db88b---69664013532.pdf
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b0dd074fa93---sesadasixuro.pdf
    • http://aucoindeshalles.com/menu/file/52149118722.pdf
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/dq8urmhn9eo51nbshj5gp2tp1b/denuzimigef.pdf
    • http://remont-elektro.eu/archiv/file/sixijolinumorusesirekuzid.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/os917hn4m8oar5suuot5augegk/xurer.pdf
    • http://nhhs78.org/clients/63854/File/belupatojos.pdf
    • http://blpest.com/UserFiles/file/koxavajimakubugijam.pdf
    • http://monkey-do.net/userfiles/file/23131703414.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=fifa+mobile+2020+apk+download
    • 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_off0000ec17.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC17 16792 bytes
font_01_sfnt_off00010429.bin
991ecba390222a388b0bd5529ac00d5388be87302d0080e27e2f3eab76e4aed8
pdf-font-stream PDF embedded font (sfnt) at offset 0x10429 16840 bytes
font_02_sfnt_off00012f7f.bin
84b2d982eacf4deffd18ab2bc84cc2c962a20daf88a4537882417f41d25ece7b
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F7F 10832 bytes