Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d5c8ccc715a79ed…

MALICIOUS

PDF

82.7 KB Created: 2021-09-07 21:15:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4e89013e003f6885d613944c249001be SHA-1: a2b551e57e58e48c07cd79036167f3e1b619e777 SHA-256: 4d5c8ccc715a79ed30477ebcc486252a4b16eea3cffb1f44ee8d8f0ec7d793de
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to external sites, some of which are hosted on compromised CMS platforms. This suggests a phishing or redirection attack, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://adlinefor.com/home/webagen/public_html/korn/data/file/39221688947.pdf In PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/ada835ae4df764baf42c6386589cdbf0/fijosidav.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/5a86fd5a2100271c153d1d218d591731/xotisekozapokovami.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b968d34c830---tewaribaz.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/h5t5u00o2adbclne8m330a74do/fefubi.pdfIn PDF document text
    • http://klccpa.com/userfiles/file/gevilorajeroxon.pdfIn PDF document text
    • http://china-zub.ru/userfiles/file/93418257202.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c71b039b8ce---92574528261.pdfIn PDF document text
    • http://mega-treid.com/userfiles/files/59489500955.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/jupesesurarobofafo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a72a8d2b984---rejinoxa.pdfIn PDF document text
    • http://paoladebenedetti.eu/userfiles/files/zijigovinekajezulederiti.pdfIn PDF document text
    • https://gencerenerji.com/resimler/files/24441612991.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/33634585137.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/d4cf6999bf0a6ae35861ebf1ee9199e5/8783702451.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f8d20a9510b---72046064657.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/16074653939fa2---69344983490.pdfIn PDF document text
    • http://mmbc.cz/_data/user_files/file/jabobojazipujexozatepi.pdfIn PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/78518036043.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/bexetoko.pdfIn PDF document text
    • https://fontaine-eva.fr/userfiles/files/46177307927.pdfIn PDF document text
    • https://sp-pir.ru/wp-content/plugins/super-forms/uploads/php/files/da22fcab5ddb2a17765d082661b92e0f/87848796849.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/27204013803.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/34921b14371a672de18bd172236a3e61/xejogelejametubumexow.pdfIn PDF document text
    • http://www.kevimotor-rock.hu/files/files/fuzodusinopomos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=conic+section+class+11+ncert+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_off0000da57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA57 19336 bytes
SHA-256: 083f6635568510105e356cc4b6d25220085be061d4a230f6238d953b51c86ff6
font_01_sfnt_off00010c26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001243d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1243D 10696 bytes
SHA-256: 783f2855ed461f231d02b9b395e3866acae21ea5fca38b790df58eaf2cdb00ab

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