Malicious PDF — malware analysis report

Static analysis result for SHA-256 4065019a5c45602c…

MALICIOUS

PDF

85.3 KB Created: 2021-07-10 02:35:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 91f715ed68245e00c35ad364502f2a51 SHA-1: 7a1ca0e2b9654063fc8d6bf79ced3e5bd1d1eef5 SHA-256: 4065019a5c45602cba2e1bf7dfc8a6a833a2e8d49cf7fe06c52709a8dcb2d042
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The 'SE_CALLBACK_LURE' heuristic strongly suggests a callback phishing or tech-support scam, where the document prompts the user to call a phone number. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a phishing attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/cae3c48ffe30379a9ba0d3c0bad2e21a/jagaxapuminitej.pdf
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608104c7be481---27909999025.pdf
    • https://fruzsiflame.hu/userfiles/file/48695796632.pdf
    • http://ruben.pl/ckfinder/userfiles/files/pokewifatow.pdf
    • http://toyotarent.kr/FileData/ckfinder/files/20210607_498940C9FBAD9333.pdf
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/rqoms1a7ket9jkd8faud89gd1e/vufex.pdf
    • http://ya-ke.cn/admin/upload/texuliso.pdf
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160a292bf0562d---binejuri.pdf
    • http://lohsclassof70.com/clients/3/31/31ca850ff086a58b81c8700e10a01852/File/4843008503.pdf
    • https://norservis.com/files/files/resepom.pdf
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/71081270b6ddda8c0832c6c2e2c6bcaf/fosifoxesetemugifex.pdf
    • http://www.onlinetemsilci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607933047ee0c---fuwunepepazinipot.pdf
    • http://allycatering.com/userfiles/92457871715.pdf
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/26cd8dd4ed9073b232e5f11b0706d6fa/60505286354.pdf
    • http://adance0112.com/upfile/editor/file/nokagab.pdf
    • http://learningkey.org/userfiles/sukorurogoremageb.pdf
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fc0cf6c94f28f5b0cba65e13eb7462ca/8539813291.pdf
    • http://wooshin.kr/uploaded/file/140694899360b2f81ac3823.pdf
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/29b40e4ad6bf0e9fc73da9507e240a9d/pipaxinebenufadojidosidin.pdf
    • http://asesorgubernamental.com/images/file/damevajotorepenewafevomun.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c95acbc1c79---mimananagutu.pdf
    • http://tuzvedo.hu/elemek/file/xinogofebemezubusukudu.pdf
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1607f133634785---5238993565.pdf
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d935904e10---wutetizu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=steamboat+touring+center
    • 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_off0000e97e.bin
f6396a55f39e171e4aef4217ead16c8823fef6cb817ca321ce5168308840d736
pdf-font-stream PDF embedded font (sfnt) at offset 0xE97E 10672 bytes
font_01_sfnt_off000101f4.bin
f913ae8360f02b19264601d85d07db2ab4428538572b8ed5b245ee3a5043342b
pdf-font-stream PDF embedded font (sfnt) at offset 0x101F4 17860 bytes
font_02_sfnt_off0001302e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1302E 16792 bytes