Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e2d516e4d032867…

MALICIOUS

PDF

81.6 KB Created: 2021-07-03 13:14:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: da35fcb58ef14062d08ced61fef2345c SHA-1: c8a4c8897317afe1dc86ecf0c5d97a6165756f12 SHA-256: 1e2d516e4d032867c3be58233c5cfcd00da2cd9b7adc6139a3026da5fedbe2f6
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress upload directories and other potentially malicious sites, suggesting a phishing or malware distribution scheme. The PDF structure itself appears to be a link farm, designed to redirect users to external, untrusted content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1606e61607ac2c---supawewewepamutizejox.pdf In PDF document text
    • http://hydrem.ru/images/file/37268200199.pdfIn PDF document text
    • http://famillespourstarlight.com/clients/a/a9/a9b42c05011d3bb27e7f7ec2ed30324f/File/dejaxurojux.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16099dc3f26bbe---27053616855.pdfIn PDF document text
    • http://formel1vermietung.de/userfiles/file/25031714820.pdfIn PDF document text
    • http://jkphotocon.org/data/userfiles/files/9449101747.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1607574144a519---32019896279.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160850c6ad5032---76038380549.pdfIn PDF document text
    • https://transport-vehicules.fr/userfiles/file/69902799364.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210503074924710310821.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160825ad28051c---pikufaxajatotel.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc42db43c0---rebosodunodaje.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/3ab0f65a1caa2f8f0938d6ed04962cec/dewore.pdfIn PDF document text
    • http://gsxr.hu/userfiles/file/jisivewewafekepitenura.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/007628d26a84ee312ce0e87e06117597/daginorapabew.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d556bc4c3ca---wupitafoluwid.pdfIn PDF document text
    • http://maduraigarlandshop.com/userfiles/file/susorixumosa.pdfIn PDF document text
    • http://xenangheli.vn/public/files/40663686047.pdfIn PDF document text
    • https://twinslock.com/ckfinder/userfiles/files/negix.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c8cb69bb9e8---3014354429.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/b6c5fc09bd0bd39c4a32605a93edb0f3/kewenotised.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16070301f627b1---vepulipizuwewadesaxa.pdfIn PDF document text
    • http://kawoka.com/userfiles/file/32935394622.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f08d115237---lapilokofetutebegetuna.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=recipe+for+elotePDF 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_off0000dd5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f56e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF56E 17452 bytes
SHA-256: a6f11c0b454cbd326f20f9b8ee66737f663654f3e083eeee5089f097a36f61b6
font_02_sfnt_off000122fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122FE 10084 bytes
SHA-256: 4ec686ecb2857de096d0c62f0bbb41c839f4160e25aaf475ff8236b1742d1e24

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