Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce92a3d0a94e6787…

MALICIOUS

PDF

101.3 KB Created: 2021-06-26 14:03:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 519fb16bdb882249fe52cd40e6f239b0 SHA-1: 7821ff3d8ee9a3a33636de546a705b636aadba3c SHA-256: ce92a3d0a94e6787bc2a0d3e0ba9dbbc85bfa883eda2d61ad4b5c116ca3eac87
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS upload storage, suggesting it's designed to redirect users to potentially harmful websites. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure points to a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9711

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://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba1c5972f0e---511766731.pdf In PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072f776309d3---32373272194.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/9d6ba00a0b6c2a2800a4a1cb00388dc9/39742688451.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c92ea2c7933---netubimilevatevabom.pdfIn PDF document text
    • http://enjoybowlramenandpoke.com/uploads/files/7838997967.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/47856163306.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/9hhdqe82bc3to5je0huvjr0ob6/werifenemipizamu.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/19888598d7b6fc383e1581b046e72503/wumavofolesamarola.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/geriruzitibajotef.pdfIn PDF document text
    • http://iphysiology.ru/upload/zuwovilinobi.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/b204c4f8ac0cc60e3804401f941a9313/wekuzuwuruxalapafori.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7f27d6bd2---kajilixeripalobizarotosiz.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/243a72bc6e63a33a36545ed26cf8bfce/92097786098.pdfIn PDF document text
    • http://abpaluso.com/upload/file/jagon.pdfIn PDF document text
    • https://autotrans911.com/thread/admin/uploads/file/54233104110.pdfIn PDF document text
    • https://beauti-full.ru/uploads/files/32057302228.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b8049c3b2fc---71431878221.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/nj1dhthluki5a97qhmeoscf477/piwixosesexef.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b46f8299b2e---89805526908.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e006a67446---kokuzak.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad545db7e6---26062076948.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d6676c94ddb---21779462753.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/lb3n8s12asjlgs5kre6lc1370l/zefikikoxikukakewudog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=endogamy+meaning+in+tamilPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off00015406.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x15406 17040 bytes
SHA-256: ce497427cb3f009696a54f8d84b9619e94b58b8c120f7e721d39c93990517e14
font_00_sfnt_off0000f360.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF360 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010b6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B6D 2824 bytes
SHA-256: 69090860f21a5a61ec7e706fb07b86d7068364c346d8f1835a564bbe62b03046
font_02_sfnt_off00011738.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11738 23980 bytes
SHA-256: ae35b42bed96304d75ed15add189c6470a38e661a61060f4e4f7bd14f297a81f
font_04_sfnt_off00016d39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D39 10420 bytes
SHA-256: a64be0576c7d747101e661bccc39d5070487ef05b9f432a0e9a9930c7cf6f6ce

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