Malicious PDF — malware analysis report

Static analysis result for SHA-256 b72e76de6afca7e7…

MALICIOUS

PDF

88.0 KB Created: 2021-09-04 00:03:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 096a76d7728b42374daa2085dff6ce28 SHA-1: 35391a50d3ed459a0496e19d3ad4bf505ffc5b42 SHA-256: b72e76de6afca7e794c6344da4c362a18bcb08e09dd42176ba2a4b091f9182aa
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous disposable domains, many of which host PDF files. This pattern is indicative of a phishing or malware distribution campaign. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests the document may instruct the user to open a password-protected archive, a common tactic to bypass security scanners. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 http://greece-ex.com/images/blog//file/5551838167.pdf In PDF document text
    • http://2016.letnifestiwal.pl/ckfinder/userfiles/files/sexupibo.pdfIn PDF document text
    • http://dotacjedlaoze.pl/userfiles/file/rilanamulitajisa.pdfIn PDF document text
    • http://dgjst.com/upfile/file/70839057663.pdfIn PDF document text
    • http://antichigelsi.it/userfiles/files/wixisonepazepamuzapasa.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/fb2b4fkfbi06l809deuo08ef87/31882970669.pdfIn PDF document text
    • https://ambulatorioveterinariosismondi.eu/file/witapulitowowutodagunobin.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/2e3hik614ck9i6v4kdfaeh0f0k/6264043201.pdfIn PDF document text
    • http://luingpyrex.cz/foto/Image/file/wexezosapav.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/7682981a130e3a5fe49e584ae35f4422/39893215431.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16095ab76b6448---zafunufatokudafelonefibo.pdfIn PDF document text
    • http://faizleathergloves.com/userfiles/files/salagu.pdfIn PDF document text
    • http://rana-international.com/userfiles/files/84276280007.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/kqddpffaaqshqngfcp5dahvvv7/41759541541.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/bekafezafofavoso.pdfIn PDF document text
    • http://bagiez.de/userfiles/file/3296605587.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/pibibufajokunowina.pdfIn PDF document text
    • http://medicaldistri.com/ckfinder_files/files/26654962923.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/lafer.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/5998609364.pdfIn PDF document text
    • http://bukhatirhomes.com/userfiles/file/kiwub.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abb3c48b3f7---tokolokemope.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=scrambled+paragraphs+worksheets+pdfPDF 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_off0000f046.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF046 18312 bytes
SHA-256: c32a33791e10b10599fc1ef39352214560d6b996551080b8d69edac4af8b4bab
font_01_sfnt_off00011fbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000137d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137D6 11264 bytes
SHA-256: 07b3eec040a0dfb7dae07d93e0ce8312175a3723e8723c5d4ffa160f792f9aca

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