Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca171a4e6ec609a8…

MALICIOUS

PDF

82.2 KB Created: 2021-09-19 02:30:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ccd6a31033d4d9ce7d688dbab21fa6d4 SHA-1: e54ed63d2c8c51aae5cbe4ad7d07f442b74095d8 SHA-256: ca171a4e6ec609a88f93fe84787865d74854840dbdf7987c9e26bb60911c9c16
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating the PDF acts as a link farm to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://allytemp.ru/uplcv?utm_term=another+cinderella+story+movie+online PDF link annotation
    • https://shoppingplanet.cityplanet.ro/ckfinder/userfiles/files/wizipawi.pdfIn PDF document text
    • http://xn--80ab1a9a.xn--p1ai/sadm_files/83727769300.pdfIn PDF document text
    • http://baodieptailor.com/uploads/2021-09-16/images/files/49760070482.pdfIn PDF document text
    • http://domplus.su/userfiles/files/gajibufukokuzenezolaxu.pdfIn PDF document text
    • https://jcmimoveis.com/userfiles/file/vezifetunozugo.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/bq0qhn2lgn0k9jf92r7i6oa46i/wiran.pdfIn PDF document text
    • http://raffaelecavazzoni.com/userfiles/files/vitukosuluwemiripulisobap.pdfIn PDF document text
    • https://thefertilizergranulator.com/d/files/muxegabimetuwizaxunoti.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/36748736087.pdfIn PDF document text
    • http://veterinariacasettamattei.it/userfiles/files/mijarope.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135f325eabb2---19775745590.pdfIn PDF document text
    • http://zangerlelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/17705888586.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/161416d3f6d762---jewedolij.pdfIn PDF document text
    • http://haciogullari.com/depo/sayfaresim/file/wopilunawaw.pdfIn PDF document text
    • http://chi-kara.net/Upload/files/xexigojezemirafesisuvewag.pdfIn PDF document text
    • http://www.pzkexie.com/up_files/file/50810037646.pdfIn PDF document text
    • http://antonioruizabogados.es/userfiles/file/41875494212.pdfIn PDF document text
    • https://e-room.co/userfiles/file/ziweju.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/zidavasobav.pdfIn PDF document text
    • http://vagtteam.com/userfiles/Files/leziwugorosukiko.pdfIn PDF document text
    • http://h-p-n.fr/catalogue_dynamique/file/nidakegur.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/fejaxavew.pdfIn PDF document text
    • http://e-skala.pl/userfiles/file/watawukinijijowosumetuw.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_off0000daf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF7 18284 bytes
SHA-256: b7aed3480f8cee30a159b3687d9097c5526a39db71645fc5451bfdf0089c9150
font_01_sfnt_off00010a6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012286.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12286 10796 bytes
SHA-256: 2c11d98563d5248ee78c05122eb0c568b3aaa9ed0d887940ef838b435f12fa5c

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