Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1f0da823f94ecd8…

MALICIOUS

PDF

81.8 KB Created: 2021-09-04 18:16:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 703a6e05e3b562b883dabb183e3b771d SHA-1: ce3f939d788f1ae99e2f2a481b508b232d2e4da4 SHA-256: a1f0da823f94ecd8b891b2eedb4c85ff7d7ea681cd30a662a2c64c722bd05971
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution attempt. The embedded URLs, while some are marked benign, contribute to the overall pattern of directing users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://animaliadielisa.com/file/fezag.pdf In PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16072cbf576120---36892120667.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/mobuzibogisufurosijikul.pdfIn PDF document text
    • http://chithanhplastics.com/uploads/userfiles/file/8325858510.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/8df9e07de60e6f764420eb9f8d05687f/pitotofu.pdfIn PDF document text
    • https://keralatemples.info/ckfinder/userfiles/files/59354311081.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160832e0c28685---polajufeb.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608501cd066d6---12732342930.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16093228f3648c---gomizinim.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160811abe7c949---zogiwugabevabameredefuna.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/2967731a52db7281120aa9db781a1392/39456260638.pdfIn PDF document text
    • https://elpollopaulino.com/cenavarra_userfiles/files/mawurezufafijogixizuva.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210505182957686.pdfIn PDF document text
    • http://carszana.com/image/upload/File/genopedosironakigepirov.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160e7a36f14dea---41859165407.pdfIn PDF document text
    • http://joyearland.com/ckfinder/userfiles/files/29285380893.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16129f77d56bf7---tofukaw.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160b44e605bdbd---tavevepotopoxevidefutijo.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1f83feb106---zupinafidixegaz.pdfIn PDF document text
    • http://xlpe.net/Images_upload/files/jidazinupobemasixiz.pdfIn PDF document text
    • https://ocw.tw/uploads/files/22706954636.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/xamipodusevijivafufe.pdfIn PDF document text
    • http://bouwbedrijfansing.nl/userfiles/file/54802894333.pdfIn PDF document text
    • http://alumcity.ru/userfiles/file/69444264164.pdfIn PDF document text
    • http://www.centralperdana.com/file/berasogixuxubazilob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=pdf+file+download+for+android+phonePDF 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_off0000dc2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f442.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF442 10416 bytes
SHA-256: 56c7c509c8793544268524121c2104ab474bdeb6770bf61a99483c94eea65f31
font_02_sfnt_off00010bba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BBA 17724 bytes
SHA-256: c289a0fb039dbf16b6613e66397e5abeface2972e1637b69f082f0e9dc5953a5

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