Malicious PDF — malware analysis report

Static analysis result for SHA-256 40c8d41656adb35c…

MALICIOUS

PDF

88.1 KB Created: 2021-07-08 11:25:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e2ab22b9deaad9cb9bc1c3f62b17d093 SHA-1: 530173c9f5e3c645eb62dc90e44155f444f96a58 SHA-256: 40c8d41656adb35cef4e5f1012dfd9a7f901839d26a2bebd38b1634076886845
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many of which point to compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to deliver a phishing payload or further malware. The presence of multiple links to compromised CMS upload directories suggests an attempt to host and distribute malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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 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://camionespanamericana.com/userfiles/file/togemazirerudebukikitome.pdf
    • http://asiancfea.org/userfiles/file/2134117606.pdf
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/16087145a8d30a---36664419262.pdf
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac3e1361a2d---zibepokiputakofakodosilaf.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/a190e55af2c21b8892ef04988da0b3cf/faxepobitimakixinom.pdf
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160866594818f0---xiriredawafinonokamulana.pdf
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608de8fc803ab---1309645958.pdf
    • https://yarpaket.ru/userfiles/file/37389209217.pdf
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/e91592386a8d0b25be1198d2b96e5afb/32469472984.pdf
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/076ffa589d9eb39f72dedfe222a1a2a9/vijilomupamudawis.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/e7m6gm88t35i9qqfulduf8qb8b/95602148892.pdf
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9ee10c9fb5---modalomivisanoworadafit.pdf
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16095bf6704b65---nevunimivebedalexerefud.pdf
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/1hr8iceci6fc7666v55f0seoa5/potakokosebafaginikuvomu.pdf
    • http://bfr-bialapodlaska.pl/userfiles/file/mujuzebosojoninatujazaw.pdf
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/569ev1meifusj7049hnp78n5sk/leven.pdf
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/53747555493.pdf
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/d5f74824b720f9840bc24ead7fca9bd5/51630095303.pdf
    • https://taxiparga.com/wp-content/plugins/super-forms/uploads/php/files/038f3c55374a3c3dfee508f75848bcd8/92872959030.pdf
    • http://oilandgaswork.com/userfiles/file/rugujoziwejuripitojowagi.pdf
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160700234c890e---27941689719.pdf
    • http://permanentnimakeup-brno.cz/userfiles/files/3006005787.pdf
    • http://chiangmai-clean.com/user_img/files/sutifolezolerase.pdf
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160983e4a152a2---73331613526.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=i+had+anal+sex+with+my+sister
    • 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_off0000f87c.bin
06fd4ec69a50e1701f86104aacb4791683f6a5745b44c1114b83c1204c9c12a6
pdf-font-stream PDF embedded font (sfnt) at offset 0xF87C 16400 bytes
font_01_sfnt_off000122ea.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x122EA 16792 bytes
font_02_sfnt_off00013b01.bin
f280a4bb90a1c629fa6eabb62127552dbf3d04da3aaeb2cb56a37439257e3bd0
pdf-font-stream PDF embedded font (sfnt) at offset 0x13B01 10644 bytes