Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb90afc09802e2f9…

MALICIOUS

PDF

79.9 KB Created: 2021-09-07 18:29:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: defb497981d81e29e86a068ee3ac0722 SHA-1: 9e36c16617453c4348ae4c2fbc5f851ef1c208d9 SHA-256: bb90afc09802e2f926d354df71aebd65306e41ec654bef8e87016c3255844820
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users. The ML classifier strongly indicates maliciousness. While no scripts were extracted, the structure and URL distribution are indicative of a phishing or redirection campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 5

  • 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.lashharmony.co.uk/wp-content/plugins/super-forms/uploads/php/files/9a7d3g50hcopq4l4qdu048h8hv/xomunuvavedamebibowoli.pdf In PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160771e9e01b0c---23280260965.pdfIn PDF document text
    • http://dorisemitchell.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xuxinoxopetonadizogipizag.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/14475614110.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/39856691841.pdfIn PDF document text
    • http://www.golfusa.be/userfiles/files/kilukenowoxikagugituru.pdfIn PDF document text
    • https://motacademy.it/file/72676174376.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/dasajuz.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/92a97c9d513d7d6a1f826c79dc9e484d/molepujopip.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/5f39662d28391fc6eb75aec4abde2350/libexelijatisogazob.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/netanigenobikuxunusaruf.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/06/23/file/zuvufajilekajakapi.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/othartper7i55rir0uokahjij3/kaxutoruladetaso.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160afa5d153a87---65264887201.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/84989d9e91663e24fc3b5f7219cf3991/83741844473.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/793d526263a8c2b8752f8ba11bd1ba56/28900105813.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1af6b15e2d---89750486933.pdfIn PDF document text
    • http://loca-granderoue-montaletang.com/ckfinder/userfiles/files/pelakekipo.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/0352cfa2cfc378a72c78e20b19bebb7b/valozifixu.pdfIn PDF document text
    • https://hansenlight.com/UploadFile/files/1383696012.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/8b60813e1b28139549251ee78b781142/75709244102.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/67144992256.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=pdf+to+word+conversion+software+free+download+full+versionPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d2e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2E8 17376 bytes
SHA-256: b34a15d5d19004f3b7ff4cfda688b37aa7615917474b003619fad9c84ba79693
font_01_sfnt_off0001007f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1007F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011896.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11896 10724 bytes
SHA-256: b5d91a402342c951e703682ae170850b3a2040ef9e5c524fe457c0cc2f6ab7d8