Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6116c4fc17d7205…

MALICIOUS

PDF

111.7 KB Created: 2021-06-26 01:35:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0fee511671e5cd99c74e4b8dd4a6df30 SHA-1: 8f548d294f7a4f8382a858d7d20792b3f5e0a7a3 SHA-256: e6116c4fc17d7205c4a675f0ce21bdf5a0f27204b1041d7a3028a9b3f5b4efdb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as containing a link farm pointing to compromised CMS upload storage, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV also identified it as malicious. Although no scripts were extracted, the structure suggests it is designed to redirect users to malicious content hosted on compromised websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9866

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://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160c856257b2e3---kojow.pdf
    • http://kochamsushi.pl/UserFiles/file/tuvexebub.pdf
    • https://www.analfissur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c76e277934---61203170998.pdf
    • http://bobhendrix-law.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/21027671226.pdf
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16079633c2f856---vazopazurazeku.pdf
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/dfe368fffb082100947600a02aace216/70410594859.pdf
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/a0e11ce5f2e48d58f00bfe49f146a837/73750991169.pdf
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608191c94fe66---17568697871.pdf
    • https://gites-les-bardots.com/userfiles/file/62246328618.pdf
    • http://fatamorgana.fr/uploads/assets/file/68869848281.pdf
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/4b9de5657aa0895e83753f73e9d436fa/bujifikejugizodegobowadi.pdf
    • http://savalis.ru/userfiles/file/vurasudu.pdf
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160a42a09ae6c4---gakulunaditip.pdf
    • http://secohthailand.com/file_media/file_image/file/44500171907.pdf
    • https://syntellect.ru/Repository/file/50631235740.pdf
    • http://isgsrl.it/images/file/vojitif.pdf
    • https://ajitcoatings.com/uploads/tisub.pdf
    • http://austria-ex.com/images/blog//file/66548321866.pdf
    • http://peaceinsrilanka.lk/userfiles/file/30146146491.pdf
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/acdfd1531a0d51bb908d98850c5787c5/51058107218.pdf
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b213be5bbb7---46506042859.pdf
    • http://robwalker.net/fckupload/file/seribaxiwowob.pdf
    • https://banghenails.com/upload/file/87618319442.pdf
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160798a841361b---23324122809.pdf
    • http://tingyi-bnb.com/CKEdit/upload/files/sitimoki.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=unilateral+galactorrhea+causes
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/19f8e84aa1d197db318a6bb9a5d958b0/tofusofozarijepegiz.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_off00014fb6.bin
586e1a40b7337aad21465162f07b3fc1943bcec63e96a9ecfa356eef12463389
pdf-font-stream PDF embedded font (sfnt) at offset 0x14FB6 10616 bytes
font_01_sfnt_off000167ee.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x167EE 16792 bytes
font_02_sfnt_off00018000.bin
dbbd09492d324433974bec70bb03a909b426f8ef75d42860c76b6602ddfa598d
pdf-font-stream PDF embedded font (sfnt) at offset 0x18000 18840 bytes