Malicious PDF — malware analysis report

Static analysis result for SHA-256 b95eacc10171b6af…

MALICIOUS

PDF

90.1 KB Created: 2021-06-26 06:28:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 5a0636e691d5aae197f565ce234b0cff SHA-1: 0184a9f7e53c6ee5d9ab9e25101cc39aade3a717 SHA-256: b95eacc10171b6af16c4ff40f1fdd94734601d59efffb625c40b3090b91d5a55
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of multiple external URIs and link farm heuristics strongly indicates a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160c111c894881---56922114374.pdf In PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/55de813cb9a70e12f24ddf62794095c7/jiwaro.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609731a20c9fa---55759582803.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/ff2c5973da2e4f0f31cfe17379f77551/63931724378.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//paxutunimogapunixiwer.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5e409aa222---64694900904.pdfIn PDF document text
    • http://ashioke.com/images/library/File/juvuku.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160c3e9d18f864---25739418759.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa45cd0ec7---notetofepef.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16084f074b1ceb---25842224563.pdfIn PDF document text
    • http://freehajjandumrah.com/admin/admin/uploadfiles/file/xapexobemotabifazewa.pdfIn PDF document text
    • http://vidol.nl/userfiles/file/49167889077.pdfIn PDF document text
    • http://rjbmachinery.com/d/files/61215807438.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607967e2e4caa---26290106471.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/33583232779.pdfIn PDF document text
    • http://bjaimama.com/data/upload/2021/05/file/202105110517415671.pdfIn PDF document text
    • http://chinasoftcore.com/userfiles/file///wegirurej.pdfIn PDF document text
    • https://profipreklady.cz/www/ckfinder/userfiles/files/79315080710.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d08443a2687---pugirazes.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bdf2350cd97---91063058651.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/408a27dce4b871ed67c5370cef09001d/zunijujamivigefaj.pdfIn PDF document text
    • http://massimobertoarchitetto.com/userfiles/files/zeguwusogufukorabirenewu.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/789ba524cbeb28cc4267b4c816200c5b/welevezulezu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=one+two+three+four+five+once+i+caught+a+fish+alive+6+7+8+9+10PDF 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_off0000f98f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF98F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000111a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111A1 17320 bytes
SHA-256: 98b992dac70c7e68e080e0315658fb54b17e5dcfca1d731c89ed65df4fca27d8
font_02_sfnt_off00013edb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EDB 11660 bytes
SHA-256: 3211340d6f3f1ede10492ac3fc6319f41b45014c1eb57b67bd3cb4a7cec41224

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