Malicious PDF — malware analysis report

Static analysis result for SHA-256 021ef2c4b9e49c4d…

MALICIOUS

PDF

77.1 KB Created: 2021-09-16 14:07:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: aeeb2ed7506cfd3ba4008fe3e97a843a SHA-1: 360befa95261fe05e2bbce917e14c6eb24d6a465 SHA-256: 021ef2c4b9e49c4d30211b19c92e0e206231d49f7913a1b75eea82d4202a9974
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The file's structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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.
  • 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://crysiq.ru/uplcv?utm_term=frozen+2+apk PDF link annotation
    • https://ichapps.peaceofworld.com/ichapps/ckeditor-ckfinder-integration/uploads/files/filiwabinuruw.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/1d370abfba505fdd9a743b71df0999a4/76187298067.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0a8455c3d---57465762181.pdfIn PDF document text
    • https://nucamsa.es/userfiles/files/bubig.pdfIn PDF document text
    • https://distriparkbotlek.nl/userfiles/files/jikatamaxu.pdfIn PDF document text
    • http://ipost.mn/ckfinder/userfiles/files/kupaxerex.pdfIn PDF document text
    • http://razzledazzleevents.in/userfiles/file/natutikodiwiwovadokifixam.pdfIn PDF document text
    • http://gr-chem.com/upload/files/sujimojagotup.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/f5dada7dc3d81a01da7bb616cbac0829/39889011465.pdfIn PDF document text
    • http://yksskj.com/ckfinder/userfiles/files/10434205801.pdfIn PDF document text
    • http://air-ned.com/uploads/files/gadenexulugito.pdfIn PDF document text
    • http://jnmindia.com/outscapes/admin/ckeditor/uploads/ck/files/mozebimopumudusoz.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/c625e3b03398ccfc061189767ed9a9c5/31418716367.pdfIn PDF document text
    • https://spacio.hk/attachment/file/faxegevaduk.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021091415223760.pdfIn PDF document text
    • https://speak82.com/_UploadFile/Images/file/jeropev.pdfIn PDF document text
    • http://fujiya-burbank.com/uploads/files/fixunexemi.pdfIn PDF document text
    • http://gorod-r.com/userfiles/file/nupelulusujuteriwoxine.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f697c2dcdb---41407353898.pdfIn PDF document text
    • http://stattus.com/assets/file/50422588855.pdfIn PDF document text
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/55614055433.pdfIn PDF document text
    • http://ytbozhuo.com/upload/file/031354509103.pdfIn PDF document text
    • http://goforthegreengolfpools.com/userfiles/file/52458802342.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_off0000cb3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e34e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE34E 17436 bytes
SHA-256: 1118c376a806ee8845f8a03707ef925706006f46036b2096853dff4cfab83d20
font_02_sfnt_off00011007.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11007 10092 bytes
SHA-256: 2989bc867d501510f02da799933a538ef8305fb691fc0093355e9980b0fbccc2