Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d152b0f6b3ae2e9…

MALICIOUS

PDF

72.1 KB Created: 2021-09-17 01:44:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3e6b966758e41b05cbd35402a4254171 SHA-1: ee2318eb386c7bf1e8d50abf3f6bf1316fe36ffd SHA-256: 1d152b0f6b3ae2e9453f4de83afadc29570dc3f3efbf67a6817c943bb5a2bbca
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to other PDF files hosted on various domains, many of which appear to be compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution through these linked documents. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL heuristics and detections.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://hurghadalife.net/userfiles/files/74147061392.pdf In PDF document text
    • https://geelaboba.dswip.com/ci/userfiles/files/pajimutogebirowapaxo.pdfIn PDF document text
    • http://parkergeneralcontractors.net/userfiles/file/domesalajuxaludafufi.pdfIn PDF document text
    • http://ekopaczka.pl/imgbrama/files/88048228613.pdfIn PDF document text
    • https://h1t-url12shio-turbo.com/contents/files/50037691205.pdfIn PDF document text
    • http://decoworld.in/dayafter/uploadimages/newsimages/file/74413128223.pdfIn PDF document text
    • http://bodybybodyology.com/ckfinder/userfiles/files/88166964992.pdfIn PDF document text
    • http://cuuhoatudong.com/upload/files/98832758261.pdfIn PDF document text
    • http://neuchina.org/userfiles/file/52428871850.pdfIn PDF document text
    • https://digireg.sk/upload/kefabilizenesulitipufid.pdfIn PDF document text
    • http://nandishoverseas.com/UserFiles/File/36284528187.pdfIn PDF document text
    • https://citronixdeflection.com/nbloom/fckuploads/file/nudekowewamirigita.pdfIn PDF document text
    • http://apple888.vn/luutru/files/kibaziwugiwovosegus.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/34275797498.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16130c8d26f5f2---sigafapegefemumivutobesa.pdfIn PDF document text
    • http://toyotaquangninh.org/data/dulieu/files/zirusuretemikowedizekiga.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143b6e26a4cf---11788961459.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9075a1ab0---8118670111.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613171a84c363---88185319382.pdfIn PDF document text
    • http://bn-biz.com/userData/board/file/97069454619.pdfIn PDF document text
    • https://fanaf.org/article_ressources/file/dogabikitevegu.pdfIn PDF document text
    • http://asr-net.ru/uploads/files/dujuvepojaneribedefatum.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16133b23066fc7---vodileturapefiti.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=odia+new+movie+hdPDF 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_off0000ba83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA83 16184 bytes
SHA-256: 736ffa0a5935ea8474e7907c51c34b701ea94d29fa4085b6761a3395e5128e2a
font_01_sfnt_off0000e45e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE45E 10276 bytes
SHA-256: aad735e1552bd4f64dc3726390dd49251a0182220d8391906d7f0ea705d5008e
font_02_sfnt_off0000fb4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1