Malicious PDF — malware analysis report

Static analysis result for SHA-256 47b59ce4bd03497e…

MALICIOUS

PDF

87.1 KB Created: 2021-09-03 15:07:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b4c128351e2ae166607dbd3f33fd162b SHA-1: 7707db6a3f5de27270f70a3f724ff7a586c8eca1 SHA-256: 47b59ce4bd03497e7b5aa0242063bb8feacf02388f964b48378de7e09f4a2739
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also features numerous external links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the redirection of users to malicious sites via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1609d5bd633aad---95646527583.pdf In PDF document text
    • https://olgapopovaphoto.com/wp-content/plugins/super-forms/uploads/php/files/94f24f933f3afce6dac324c6d0c28553/93980327360.pdfIn PDF document text
    • https://clubslotalmatriche.com/calcas/file/83907252569.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/72914638444.pdfIn PDF document text
    • https://keyword-lda.pt/site/upload/file/53427057821.pdfIn PDF document text
    • https://tlproduct.com/userfiles/file/30541007688.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1610888709d6ae---mugapogega.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160fb0165b3842---jezubamamawilul.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/72160678596.pdfIn PDF document text
    • http://pitin-akutsu.com/js/upload/files/58106517755.pdfIn PDF document text
    • https://principesgs.com/userfiles/file/11619344527.pdfIn PDF document text
    • http://taiwan-tsai.com/upload/files/nutewukodidikewaminikaf.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612b7afebb016---83081305715.pdfIn PDF document text
    • http://alanaf.ru/userfiles/files/19467506304.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/lisavuj.pdfIn PDF document text
    • https://transport-vehicules.fr/userfiles/file/mivogizugo.pdfIn PDF document text
    • http://gyarmatilovastorna.hu/userfiles/file/15970325989.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e2e5339e42---pupujov.pdfIn PDF document text
    • https://melz-feu.ru/upload/tazudikejigefikaf.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082fd431943d---96046834529.pdfIn PDF document text
    • http://xn--80aikni6a0b.xn--p1ai/images/file/22312239255.pdfIn PDF document text
    • http://10glazsikeyrosa.ru/file/472743898.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=spoken+english+and+broken+english+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_off0000f05a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF05A 10988 bytes
SHA-256: a22b73e8e2a19205dc59077785979b492a34a34b3fdc88ddf97c5b810b742fa3
font_01_sfnt_off0001094e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1094E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012160.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12160 17688 bytes
SHA-256: 1f9fe33b5ce2d03d0bd76d3379c509b9c0db25022d4a7c1948a7eaa07734a1a9

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