Malicious PDF — malware analysis report

Static analysis result for SHA-256 318b0bd40daa47ca…

MALICIOUS

PDF

91.4 KB Created: 2021-06-11 00:57:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 03d9698a97b7a34527e4790497be9f19 SHA-1: 648c23c53d1e1469d99980acebf8bb5209aafe04 SHA-256: 318b0bd40daa47ca33a532741d07ef6edf4afcf3687d33b4f11deb8d9318c97f
156 Risk Score

Malware Insights

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

This PDF document has been identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document functions as a link farm, with numerous URLs pointing to various websites, including those hosted on compromised WordPress installations. These links likely serve as lures for phishing attacks or to distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://krisoc.ru/uplcv?utm_term=tom+and+jerry+pirates+full+movie PDF link annotation
    • http://wooshin.kr/uploaded/file/41565672260b5e16858196.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080735e6e0be---viborifopagosiwejiw.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4ba2415f8---ziravatuzutitaxajez.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/ee5af2e83f965093b17a5ff92f9481a3/ziwujaragironolobas.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/69243347626.pdfIn PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/4ffdc744874c74bdc3df40d083111717/tugegupusipe.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/fovbt933hno8q9ahonqhp4n5me/47967459314.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/09c918408d38680332fd5a9dfcec1645/89973103594.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a73eaf1d816---19798610995.pdfIn PDF document text
    • https://vigiweb.cl/dinamicos/files/file/12554461427.pdfIn PDF document text
    • https://cbdc.co/uploads/ckfinder/userfiles/files/nojominaxolidakojexow.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b048fa60268---65384009044.pdfIn PDF document text
    • http://oilandgaswork.com/userfiles/file/8021471699.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/8qm0ungd5q8q9sotun9hh30504/mezamadujigofujof.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/gmabbhd4t1vptbfgvkt70rc750/kexubofejaxaka.pdfIn PDF document text
    • https://equator-maritime.com/userfiles/file/gipokewibilajobitemef.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00013edb.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x13EDB 20084 bytes
SHA-256: 762180abf8a0d1b4b4bfecdc809e2c2e4bd3c6310681dbef316a81a846d6bf05
font_00_sfnt_off0001040d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1040D 5372 bytes
SHA-256: 55a5999ae244bd744c6f4784613f1658994732f2ba14bd5b1dd284fe5eaa12c3
font_01_sfnt_off00011653.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11653 11888 bytes
SHA-256: 5639775b4c36f317825c981533ce6b9374f7dff1297340bc5268b01e41dbcb5d