Malicious PDF — malware analysis report

Static analysis result for SHA-256 4983e70d4f6a8408…

MALICIOUS

PDF

78.0 KB Created: 2021-07-03 06:52:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 59b74726ce63e22af3fc0f17ececd401 SHA-1: 4b815b691f5ac41b04671ddc14e1e8e9339d7711 SHA-256: 4983e70d4f6a8408a44319b43caa4bd83744f12d2f6ebeb87bb41712fd622f0c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL patterns indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://sanaspinler.com/calisma2/files/uploads/8044995706.pdf In PDF document text
    • https://cissud.com/uploads/ck_editor/files/renudalemagoz.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/43192948499.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/7ab0ad761ca2325efddb6ec29ee2488d/45041132583.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086109e7fde3---94657377500.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/18977135131.pdfIn PDF document text
    • http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/13767108435.pdfIn PDF document text
    • https://diaspoassur.com/wp-content/plugins/super-forms/uploads/php/files/b48343a92db3279783bec3e910baf8a0/10886094023.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6d93429d0---41324291163.pdfIn PDF document text
    • http://co-wemart.com/careeruserfiles/file/bivagumusukolori.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e04294513a---sozixewogorelefupuwuna.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/564b38df4b5c6a401039b9179bc91914/zovawivegijaxabemuki.pdfIn PDF document text
    • http://benhvienlaptop.biz/userfiles/file/dasuxibokesaxoreman.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/imi3gj3tp1ad3q8u707g4bes01/18468835014.pdfIn PDF document text
    • http://avision-italia.com/userfiles/files/39296638500.pdfIn PDF document text
    • http://vitaminyplus.eu/files/file/savasubulowupipuwus.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16071c002e371a---fisugevewakovunesoworalal.pdfIn PDF document text
    • http://techbico.vn/uploads/image/files/bebelajoriw.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/34841288970.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/xubiko.pdfIn PDF document text
    • http://cdwy028.com/uploadfile/file/20210611073303.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b37372ead0---wuxedebazinasonokefosisi.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2a1ebb284d---79543315834.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8286f14f3---xubuji.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/kelasawikexonuwokujizose.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=i+just+thank+you+lord+for+making+me+me+lyricsPDF link annotation
    • 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_off0000cb66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e37d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE37D 11312 bytes
SHA-256: e8bc87c579c18c25af4229c6f729c2ed1714ac083c1d7db24d13309f18ff6384
font_02_sfnt_off0000fdb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB1 17140 bytes
SHA-256: 4f9b2979c06629e925e28d355a69b7d55e8fd3eb500cf73001da69b270cbeae0

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