Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9e622350644c560…

MALICIOUS

PDF

97.3 KB Created: 2021-07-23 21:19:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: f3c2a82cf99c68ce8df38b2143f785e6 SHA-1: 8e93e6750e043dfda21cd7a519d7549c115a685a SHA-256: b9e622350644c56034ca4548ce5e019766c0ebfb828a9b7480a5bd037f8f6e76
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised WordPress upload storage locations and disposable hosting sites. The primary goal appears to be directing users to potentially malicious or phishing content hosted on these sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9761

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://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160e8cb71db604---vinamunuk.pdf In PDF document text
    • http://sanchariglobal.com/userfiles/file/94021496768.pdfIn PDF document text
    • http://bhhangkhong.com/upload/images/files/nilawizebinuzaxavur.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b0928058361---motujomovumidopo.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/e46vehpn188c2gja5qf5dlfs99/63768127120.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074fa3515450---17666408160.pdfIn PDF document text
    • http://tatishev.ru/admin/ckfinder/userfiles/files/74495116025.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/ae15d47fb9b1b3c85ec6482661645bba/jedikegake.pdfIn PDF document text
    • https://a-pointpro.com/cms/ckfinder/userfiles/files/41943196707.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2d90ed0ad1---bilerirosizegetosameveti.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/99bf26e67e421ef6f16aedfbe36ec387/jupitodawozefa.pdfIn PDF document text
    • https://chp-travel.ir/data/file/73959070241.pdfIn PDF document text
    • http://lnyuanzong.com/uploads/files/20210716191952.pdfIn PDF document text
    • http://petraifevronii.ru/ckfinder/userfiles/files/putujitinubeluxenel.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fa676839f5f---zikoladivexetenepoj.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160728ee542b53---56742406482.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa1a8e329a---50932780098.pdfIn PDF document text
    • http://hurtglass.pl/upload/file/43878632442.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/14966737310.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/e6fb687f6cd49f4403ef1cf980040c62/webadivezukijopusuje.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16096cff48ac9a---3428726953.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609da5fe43d52---35897733704.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a40d5e6f52b---22446599096.pdfIn PDF document text
    • https://tailormade-sales-marketing.com/userfiles/file/rasifuwuxebowezapogumum.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c04b90e8e33---dilediwokedax.pdfIn PDF document text
    • http://eotp.info/sites/default/files/fck/file/12081027355.pdfIn PDF document text
    • http://www.taimaobi.com/admin/ckfinder/userfiles/files/62842661232.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=blackweb+bluetooth+headset+manualPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off0001580a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1580A 18624 bytes
SHA-256: e026410946195489b6ce499a413d05d5e4df08b329204de38a333203f9207ad1
font_00_sfnt_off0000f794.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF794 10916 bytes
SHA-256: 1c5e1356752a381266fff86f9aac7b289dc49c7d9245ade02b5ce6cc4fffaac1
font_01_sfnt_off000110cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110CC 17916 bytes
SHA-256: a0d372d1349d93766e179b6eb1f57979e3785424d194346c57160886d94bc05c
font_02_sfnt_off00013ff9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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