Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d9c8b3446c3e240…

MALICIOUS

PDF

78.1 KB Created: 2021-07-22 16:23:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 86c15fd3d3fb44c40ec4d8e2754a9b03 SHA-1: 5c84f8e9cf23f147c4df16cfbec7a539813241ef SHA-256: 7d9c8b3446c3e2409536f2559e96122e360b4b271b32d9d7cc59d32462297059
124 Risk Score

Malware Insights

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

The file was detected as a phishing trojan by ClamAV. Static analysis revealed it functions as a link farm, directing users to multiple compromised WordPress upload sites and other disposable hosting domains. The primary goal appears to be redirecting users to malicious content, likely for phishing or further malware distribution.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4578

Heuristics 5

  • 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
  • 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://augsburger-dartliga.de/uploads/file/tobevivajoronovope.pdf In PDF document text
    • http://xn--clinicaquirogavilario-vbc.com/wp-content/plugins/super-forms/uploads/php/files/h801a4f58m79rrdha5990ng5a0/xuledananabo.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/d4074ac93229cbe6571a9bb6812d1345/68887491099.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a9c98dee9ab88cf4328e2227faafafc5/bapusuxufowulem.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/i51jvlk026rvk3jov0mhpq7il5/wamufarepesamajituzib.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/xikitoxovu.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/035cb86d1e51c25eb18a325dcb978b25/61523428615.pdfIn PDF document text
    • http://maility.pl/_ADRESuserfiles/file/59046766700.pdfIn PDF document text
    • http://babywagen24.de/userfiles/file/81217908132.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160801e3dafcf6---bodojubazimigazasotako.pdfIn PDF document text
    • https://scanclean.bg/upload/ckfinder/files/86518664822.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607df5223641b---pegemetevokul.pdfIn PDF document text
    • http://changrung.com/ckfinder/userfiles/files/tukosafivimilejuze.pdfIn PDF document text
    • http://orosweb.hu/ckfinder/userfiles/files/kedopolutabuwerafo.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/a91c07d3afc19df6cfba69387483217a/sobopukupirabimup.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/xumuzalapezuve.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ed124ff3d1a---vulejoku.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1609bae5b62d21---11724184741.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/56387367207.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/sobaxododapivuliviwuroda.pdfIn PDF document text
    • http://www.tokyomagic.jp/images/library/File/mifegitagemefugorileniduk.pdfIn PDF document text
    • http://clinicaveterinariabilancino.it/userfiles/files/kiruvoge.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/6jtdbo03t9714n54pq78cpvjs5/wobos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=introduction+to+mobile+network+engineeringPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e943.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE943 16972 bytes
SHA-256: 8cdd5529331a7ccc66a7045b2fc2e02e38e5d2903b2ca7b136d1a86bc247b383
font_01_sfnt_off0001157a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1157A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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