Malicious PDF — malware analysis report

Static analysis result for SHA-256 071d9a7f83ae85b1…

MALICIOUS

PDF

72.1 KB Created: 2021-09-03 16:52:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 83ef0c4d2de7c9aeb9714f57ac5a5d15 SHA-1: 67eeb354d0fc862d3b3d1425b31d7633f26e165b SHA-256: 071d9a7f83ae85b121e8e35afbf2798d2821da6d68ea43bdb07fd2f4519274a4
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous external URLs, many hosted on compromised WordPress sites or disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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 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=toro+power+shovel+38310+manual PDF link annotation
    • http://ampletrekking.com/userfiles/file/dojonosoterapuz.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/94ca728996c9e286bcecb0bd31b0620d/gefadolefuxodejam.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9fcd00538---rexugojukexazinijopil.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16083b2b19844a---tomobovox.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/b7bnvfaarer7ophc2m08f2u9rn/45030911354.pdfIn PDF document text
    • http://zerosquareonline.com/file/20979917799.pdfIn PDF document text
    • http://conelser.hu/fck_uploads/file/514273917.pdfIn PDF document text
    • https://tckontrola.hr/files/popukoredi.pdfIn PDF document text
    • https://condicionamentofisico.com/arquivos/file/dobakeweviwoxogasofogo.pdfIn PDF document text
    • http://sl1971.com/clients/5/51/517263f0417f9379c67e6eba0e0bdfe8/File/96332228886.pdfIn PDF document text
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/cd43549ca0a0469a5b3ac88b7ef4c4cf/3037622030.pdfIn PDF document text
    • http://3qbuy.com/CKEdit/upload/files/farinafuzulapiwagazesajap.pdfIn PDF document text
    • http://kanizsakran.hu/userfiles/file/xugozoje.pdfIn PDF document text
    • http://enidental.com/userfiles/file/20210829012821.pdfIn PDF document text
    • http://kjphotocon.org/data/userfiles/files/67754455041.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/6hr65lmivf913ofe1f6hn38dn8/67575619549.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/2afm4hfde961fudacaddfp9avk/lumemiwozotig.pdfIn PDF document text
    • http://alternatifmedikal.com/img/userfiles/files/tanutuzexumubopitag.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d88b350f56f---rugazebixaza.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/1a09746cd0542e80ba06928b0415ad68/nisisigesedop.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_off0000b9c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d1df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1DF 11096 bytes
SHA-256: 7be9c3d7684771f7c0209683b6fdd129d7aee30dd898b9de3db907e7a6f4f481
font_02_sfnt_off0000ebad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBAD 15592 bytes
SHA-256: 269ed33c3c782e6c0d5c955cbc17b430d14519427aa2eaf4af9602b1fc2b672a

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