Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ade617b1af09be6…

MALICIOUS

PDF

85.5 KB Created: 2021-10-12 13:16:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 99441a56706a4dad782694bfcc5be06a SHA-1: 31cb84874f6f50df0b56d328fbf6687707ee1c14 SHA-256: 7ade617b1af09be6b478f9ede6a6685ed54e5791a10f2b4d8a6bfff4b196d930
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to multiple compromised or disposable hosting sites. The presence of embedded URLs and the nature of the heuristics suggest an attempt to distribute phishing content or further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://nomylo.ru/uplcv?utm_term=friday+morning+quotes+and+images PDF link annotation
    • http://doanekeyes.com/userfiles/docs/xomotarepulejanematew.pdfIn PDF document text
    • http://wanyuantemple.tw/userfiles/file/15560614351.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/65319578636.pdfIn PDF document text
    • https://baigiangtoanhoc.com/upload/files/90049556724.pdfIn PDF document text
    • http://chapaconoticias.com/assets/ckfinder/core/connector/php/uploads/files/wototerawajokatebiniminu.pdfIn PDF document text
    • http://xn--80aaaaaikdebj9ccf1ayja1b5a3q.xn--p1ai/ckfinder/userfiles/files/13412294586.pdfIn PDF document text
    • http://www.almansori-ye.com/almansorifiles/files/38331980776.pdfIn PDF document text
    • http://mywayrtk.org/userfiles/file/1025446853.pdfIn PDF document text
    • http://polletnv.be/uploads/files/bunajegatizeb.pdfIn PDF document text
    • https://melnikhouse.com/userfiles/file/kapigexo.pdfIn PDF document text
    • http://sial.pl/galeria/file/fezale.pdfIn PDF document text
    • http://hitelesen.com/userfiles/file/51439682584.pdfIn PDF document text
    • http://twozonechickenlasvegas.com/uploads/files/22623715515.pdfIn PDF document text
    • https://etimes.mn/uploads/files/65048652336.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/njakc421k1nuuhf2t854gajs39/govonipanugudub.pdfIn PDF document text
    • http://aa-nusd.jp/80840071068.pdfIn PDF document text
    • https://ssekolkata.com/ckfinder/userfiles/files/59037954077.pdfIn PDF document text
    • https://girisimhaber.com/uploads/file/laleso.pdfIn PDF document text
    • http://magyaringatlanadatbazis.hu/dev/_user/file/xodalonozuno.pdfIn PDF document text
    • http://cateringkieuan.com/uploads/userfiles/file/sozaxedixofoxutilesefuw.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1615f43a76497c---raxagaxufed.pdfIn PDF document text
    • http://chinalanpa.com/images/upload/File/66988241376.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148d86a3b66f---japixekozokepalewovov.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202109/file/1632302579.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/tumuwubidomezawewibodizes.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_off0000e568.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE568 19372 bytes
SHA-256: 013a7b930a7ab1b93c656b816b08322b6d1370ff15d74160b81161f2fb4d1497
font_01_sfnt_off0001174f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1174F 10880 bytes
SHA-256: 7f5b651a235598611ccb52456083b5b358e58145ea11aa25cd456878aac2727f
font_02_sfnt_off00012fee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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