Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a116ff1780d1bd5…

MALICIOUS

PDF

84.8 KB Created: 2021-09-04 18:28:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1ebeee413b5fd1bec35c247261dc3727 SHA-1: d4b2321d836c8fd7dd09d992f489335a5beadc30 SHA-256: 3a116ff1780d1bd516484e0c54cbbbfce1ef70e9aa70a50af68198d04d42c5a9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised websites and potentially malicious content, likely intended to lure users into downloading further malware or divulging sensitive information. The presence of external URI heuristics and link farm detection further supports this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://philabc.ru/uplcv?utm_term=nov+2019+calendar+printable+pdf PDF link annotation
    • http://sbox-technology.com/upload/datoteke/difazasoxizogo.pdfIn PDF document text
    • http://cosmik-kinoteatr.ru/sadm_files/gakanozegutoxalaz.pdfIn PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eb460576f3---95995524970.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16086e76e3b041---95394222587.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16098b468661a7---vumovuranowo.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/9e387e384ea0ad1f09860472305529ba/xafeninimakotafusadugu.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dcb3c73a4b---naruvamigifalobovuvid.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160885531d1d13---69938425700.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/ddihj5sfcoj4ksts688e33n2ne/tujanovawubasudusup.pdfIn PDF document text
    • http://sevinctekstil.com/resimler/files/21107618624.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/i0d1fho1s225rgm8clrpr3g17d/sejefikumikaw.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/3029dhqkhnfnjdo4kehrj5fke7/30693176856.pdfIn PDF document text
    • http://albertopizzetti.it/userfiles/files/97836584531.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/4e2540132d68d473cddf340d818406fb/58423442551.pdfIn PDF document text
    • http://myhomeinparis.com/userfiles/files/64794556895.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160bc2ed5668fa---zoparoxire.pdfIn PDF document text
    • https://chungcungoaigiao.net/uploads/files/muvabodagituxugogifokib.pdfIn PDF document text
    • http://fautographie.org/images/userfiles/files/6415473993.pdfIn PDF document text
    • https://southafricapools.com/contents//files/56415555413.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/33954973617.pdfIn PDF document text
    • http://theeultimatenetworker.com/ckfinder/userfiles/files/30124715.pdfIn PDF document text
    • http://fvv-hohenfelde.de/sites/default/files/files/vudaxunovamupida.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086e8f16434c---57151967146.pdfIn PDF document text
    • 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_off0000e694.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE694 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fea6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA6 17504 bytes
SHA-256: a8ff38733a0977638edef89c3abc6300ea389aefd691fe44158f3db0196fd491
font_02_sfnt_off00012bbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BBC 11088 bytes
SHA-256: f3f1c9d4c9321df3a72a2ff6ebdd20c1341dd47032c8a0437135eda1902ccb73

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