Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ccb20a9b6c8a8bc…

MALICIOUS

PDF

89.0 KB Created: 2021-08-07 03:00:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: aadc36ae73eedbf8ae3df6ff9d6ac363 SHA-1: c222daabbe53809261446954e48a016a44596a10 SHA-256: 1ccb20a9b6c8a8bc0e0103d2b501c630aff092b43f13193e4481d7077b3cc984
176 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://philabc.ru/uplcv?utm_term=free+guided+meditation+for+sleep+female+voice PDF link annotation
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/6e4d167210eccc6c42503c0b236b6876/56007724198.pdfIn PDF document text
    • https://mingyi-lock.com/data/file/userfiles/files/16619785751.pdfIn PDF document text
    • http://nfc.soo.jp/file/dopunezeko.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/4013cfdb223b695aea0bf7f64562599e/foxuxiti.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f40aea1ab---97828112187.pdfIn PDF document text
    • http://rainbowcaterers.in/userfiles/file/veron.pdfIn PDF document text
    • https://www.willmarshelter.com/ckfinder/userfiles/files/jidijomukokulup.pdfIn PDF document text
    • http://stphilomenaonline.org/userfiles/file/putoledumodaxe.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b9bb80a1a10---95339381203.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160e3cef7750b6---xabirarurinomeg.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/0aeb5697835b39fe9163016e7928b144/xavodanazozosumaf.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/16082dae17bd0a---11905353494.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/3402660faec4c9f2f2effb1bfaaec58e/xanozuzibolin.pdfIn PDF document text
    • https://cissud.it/uploads/ck_editor/files/rojinejekivivinunonibis.pdfIn PDF document text
    • http://halmar.info/userfiles/file/fewalezuwamekixakimifar.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c3c44a9fdd0---zofibemugosimum.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/846c73fced4f75055ef65f466f51bb92/13046717975.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1608ebb012f783---35688754517.pdfPDF link annotation
    • http://aarogyamedico.com/userfiles/file/14733930502.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160bb437a25a30---volabavaxelazi.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/f6b5b1bffe32950a03c74fdb220f447b/37445117794.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/e15a448b2cbaea114611f475d4d0f04b/beluvajorezuv.pdfIn PDF document text
    • https://divinesacredshakti.com/wp-content/plugins/super-forms/uploads/php/files/1df5df80ac06abb6d67b45abf7d36dd5/degukaxitobowavanuxewade.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_off0000f6e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E7 11108 bytes
SHA-256: 7b31a7dd8548a9483111a8647610dc9b950e7f8c8e27db2fb9c962052cee9927
font_01_sfnt_off00011096.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11096 16732 bytes
SHA-256: 06db5d0eb40d7ca8efd25b2b02ba573687ea787f2b5bb369a36b2b5a9c25954e
font_02_sfnt_off00013b95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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