Malicious PDF — malware analysis report

Static analysis result for SHA-256 82711dda7cc62d8d…

MALICIOUS

PDF

98.4 KB Created: 2021-07-10 03:28:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ad4528ae42b085273a13e66b998d7adb SHA-1: 81ac2b8d929f551df726fcb7921e1727bda0d000 SHA-256: 82711dda7cc62d8da45f3f77d62953178413ce0c10f9ad8e9309cc7f0d881ab6
156 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics as a link farm, with several URLs pointing to compromised CMS uploads and disposable hosting. The ML classifier and ClamAV also strongly indicated maliciousness, specifically identifying it as a phishing trojan. The document body is heavily obfuscated and unreadable, suggesting it's designed to obscure its malicious intent rather than convey information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/6fbe89a9c686cfe902da47479125a495/tefuvometavawe.pdf
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/f00bf328fba72c060cf092b210d7da30/53058584161.pdf
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8f677c162---37311916985.pdf
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/nl6q3mh2ppg39a1n2cujj782nr/3749295847.pdf
    • http://195exim.com/datas/files/kanapujupobisonimiwosoket.pdf
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/jsj5k8u9r7vjq2508kirlvvc72/jijofe.pdf
    • http://wirheiraten.de/images/file/53694125597.pdf
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/e56d0d6bc8a87c41350767372dd25f55/57726849317.pdf
    • http://keifo.ru/ckfinder/userfiles/files/31829404288.pdf
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/8m0fimoc3ot77dttum52rp28l2/gadotodogitarowo.pdf
    • http://anhuishangbiao.com/upload_fck/file/2021-6-14/20210614092622997896.pdf
    • http://cuspsurgeons.com/userfiles/file/refogepapibabudojalol.pdf
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bc474c77e3a---19757912440.pdf
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/7dfffba532ba406603e753fd190f89fd/ferije.pdf
    • http://contrast.no/ckfinder/userfiles/files/85735096294.pdf
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5db8f289d---68159243836.pdf
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/89cabc85dab0dccfb203f629db6fd157/96012518298.pdf
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/a7c9115fa45bcd49dd3f18041df4b807/35000156122.pdf
    • https://alternativecarrepair.com/userfiles/file/woseriroxopimonara.pdf
    • http://fitnessklub-impuls.pl/uploads/assets/file/sarekujonugomakusut.pdf
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aff76dae3a4---nufoginodimememevafamewi.pdf
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/16077bbbd34ce6---butirizivuwadofesurur.pdf
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/86fdc0955c1fef54457e7bb92a2a3bb6/kezuvemugof.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=free+old+time+music
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011f27.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F27 16792 bytes
font_01_sfnt_off0001373e.bin
611311877562c5ca62d87001557af76175e41725c3c6cd819f384c33441868a7
pdf-font-stream PDF embedded font (sfnt) at offset 0x1373E 10344 bytes
font_02_sfnt_off00014e94.bin
e5b6ec49e6116117614c82b769f3f79e927afca55cc1f0d0915e356cf5aac4ab
pdf-font-stream PDF embedded font (sfnt) at offset 0x14E94 17828 bytes