Malicious PDF — malware analysis report

Static analysis result for SHA-256 ace06abec9eef5bb…

MALICIOUS

PDF

73.3 KB Created: 2021-09-06 20:36:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 225d1f753b4e001d396f71dd0ec8fc7b SHA-1: 71d67c8c1ea931e5cdf08f7e945d13e7a4cb5d70 SHA-256: ace06abec9eef5bb2a46d1552e274d93847ae005bbde8a8c369c00557b40d9aa
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous embedded URLs pointing to compromised websites and link farms, suggesting an intent to redirect users to malicious content. The document body is heavily obfuscated and unreadable, preventing further analysis of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://cructi.ru/uplcv?utm_term=2009+chevy+malibu+ltz+manual PDF link annotation
    • https://senarathgroup.lk/assets/media/file/mumapitipafizer.pdfIn PDF document text
    • http://bygreenpure.com/userfiles/file/kupolovogiguzukorefor.pdfIn PDF document text
    • http://voxel-avocats.fr/uploads/file/75609510982.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/jamifukora.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160774b5e6da86---27768504614.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160e982ff53e56---22319007211.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/1s2uc9ujggn9jnd52michjsfss/jisewamosonowabate.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d7e3da538b---55171596281.pdfIn PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/44269754553.pdfIn PDF document text
    • https://www.padanguparduotuve.lt/ckfinder/userfiles/files/4856063502.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/seluzigazufesubano.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/ee1b41c0df2fe69d1900566f116e7301/fonogugisutabebafebemo.pdfIn PDF document text
    • http://attlas.center/userfiles/file/42450413302.pdfIn PDF document text
    • http://anapro.com/ckfinder/userfiles/files/87812195735.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b75bf7a72fc---jikalikeloxuxije.pdfIn PDF document text
    • https://havadisname.com/upload/ckfinder/files/31817822731.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/litogo.pdfIn PDF document text
    • https://ceccardolj.ro/userfiles/file/27147327095.pdfIn PDF document text
    • http://musicpark-live.de/userfiles/file/70980734130.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609082daed12d---farozunesuwiruvix.pdfIn PDF document text
    • https://viettincapital.vn/upload/files/tetoparak.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/iv5hf0vif9bn7v2f1gl6gkm9sd/73075609796.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b3dc91d51af---pazovenebudig.pdfIn PDF document text
    • https://www.tamilsaga.com/ckfinder/userfiles/files/xogonepesaru.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/isi3ckr2hica65m1jrfii0vov7/tifogomur.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_off0000b8b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8B1 16976 bytes
SHA-256: 02c3f623b8cb57869b84b155ce0f52ebba2760972f52827f1789ea1409b2a945
font_01_sfnt_off0000e4e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fcff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCFF 10900 bytes
SHA-256: 1fe630ed461c86b4660597c1b6543a03589a75bc25044ee1e6614c4d685d043a

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