Malicious PDF — malware analysis report

Static analysis result for SHA-256 824334c6260f163a…

MALICIOUS

PDF

83.3 KB Created: 2021-09-23 01:53:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7de5f80696d441fef15e452bd6f19cd1 SHA-1: 0de40eef4415a37141b4874c7939f391d542c283 SHA-256: 824334c6260f163a5a2c4b78dde97f285596c24e07f8de99b107f9ecdf57ac67
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised or disposable domains, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery via these external links.

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 http://www.bluefashion.cz/ckfinder/userfiles/files/78248737913.pdf
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/ao8al0ekeu1da2fbr4j02pjo07/88712888890.pdf
    • http://viral-list-machine.com/ckfinder/userfiles/publics/files/28357742028.pdf
    • https://sitycare.com/FCK-UserFiles/files/kipetodofosud.pdf
    • http://studiofranzoni.eu/userfiles/files/65004568215.pdf
    • http://reklama-v-sochi.com/ckfinder/userfiles/files/45594296381.pdf
    • https://terminal.hr/userfiles/file/77029361917.pdf
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613daff11f6f1---rusarojesedo.pdf
    • https://delaneyllc.cfonewsletter.com/ckfinder/userfiles/files/wamatow.pdf
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/161328d4fb5770---wunigawuvisujamojenadosa.pdf
    • http://haiannweb.com/uploads/files/tegepuzot.pdf
    • https://wemservice.com/ckfinder/userfiles/files/28468045714.pdf
    • https://dalton-english.com/userfiles/file/suguzizumugebibomebusumon.pdf
    • http://architettoangeli.it/userfiles/files/85278839027.pdf
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/161374832bfe80---12351950320.pdf
    • http://a2hgghk.handylover.com/upload/files/rawibosojefuronulotun.pdf
    • http://ozdesignhouse.com/app/webroot/uploads/files/26340442804.pdf
    • http://shangrilayunnan.com/ckfinder/userfiles/files/xalubipajenipuxelovilov.pdf
    • http://www.kevimotor-rock.hu/files/files/87792236416.pdf
    • http://kleinschadenexperte.com/userfiles/file/tawanob.pdf
    • http://valdhans.cz/userfiles/file/26000602181.pdf
    • https://bdata.vn/upload/files/dulovivukazudozit.pdf
    • http://hzxf.com/images/upload/File/detujatusub.pdf
    • http://taxfreepoint.com/file/54407666978.pdf
    • http://learnazia.com/fck/imagesfile/gigibevobebekulam.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=over+graphic+design+maker+apk
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df86.bin
5a846ad8973d655e234ad9adc39c20e641b14e0f76478b64b7cf2fc03e87f25e
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF86 18028 bytes
font_01_sfnt_off00010e6c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E6C 16792 bytes
font_02_sfnt_off00012683.bin
0f6d89cb7cfc3cd97189a8bd5ec7299a6fcf3c7746c80a4a7d5e08123f5574aa
pdf-font-stream PDF embedded font (sfnt) at offset 0x12683 10880 bytes