Malicious PDF — malware analysis report

Static analysis result for SHA-256 57031bf74e013634…

MALICIOUS

PDF

85.8 KB Created: 2021-09-20 07:06:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 55e1da3e166554847a5bea73fedcb947 SHA-1: d8e8741cd243c39ff01c667c1102d17bee7a4ed7 SHA-256: 57031bf74e0136348af00a68ae4207fbf69e8df55b42b816a6659afce142ef63
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 various domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this is a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://garglob.ru/uplcv?utm_term=android+auto+release+date PDF link annotation
    • http://kayapaliinsaat.net/file/68181290342.pdfIn PDF document text
    • http://lideparts.com/userfiles/file/1631256468.pdfIn PDF document text
    • http://tentimesneedlehill.com/UPFILE/userfiles/files/zizemiferu.pdfIn PDF document text
    • http://qiangka.com/ckfinder/userfiles/files/41627657959.pdfIn PDF document text
    • https://nutrishop.in/ci/userfiles/files/91127590179.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/23295514820.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/19b345a53712c4173e204efe3ee7d67c/36905139918.pdfIn PDF document text
    • http://liubeauty.com/luutru/files/23183711596.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613354dc1d24e---3826659833.pdfIn PDF document text
    • http://www.benyowsky.com/resources/files/31849344080.pdfIn PDF document text
    • http://vektor-bezpeki.com/userfiles/files/88259961479.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/161332c1f8ccb5---letesoxikazotu.pdfIn PDF document text
    • http://bon-mar.com/fck_user_files/file/bagizurorexadufifud.pdfIn PDF document text
    • https://strategie-forex.com/ckfinder/userfiles/files/bogikinopebakomagiwuweje.pdfIn PDF document text
    • http://rklatex.com/userfiles/file/96086749679.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/3d0b6d090e824c5a60a34a8aa69af892/girularezapidotijodoref.pdfIn PDF document text
    • http://geofer.eu/userfiles/files/41708692994.pdfIn PDF document text
    • http://tcgardening.com/userfiles/file/2021091606150573499.pdfIn PDF document text
    • http://sdes.in/uploads/87895132058.pdfIn PDF document text
    • http://duhochoangthanh.com/upload/files/79611424156.pdfIn PDF document text
    • https://zoorichi.com/temp/fckeditor/file/lipagoguramevesibilowuxuw.pdfIn PDF document text
    • http://capriololaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/buwipozubuwabal.pdfIn PDF document text
    • http://henzefashion.com/userfiles/file/52865624883.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/161459ee44ca2a---43642075614.pdfIn PDF document text
    • 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_off0000eba2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA2 18128 bytes
SHA-256: c31395ac24f23178a915130e1504d27a525a3892dcbe4f1719e99b292f722ae3
font_01_sfnt_off00011a2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013243.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13243 10324 bytes
SHA-256: 4e002398649ab6bbf8aa375dd3e5c1e3121ab3102e353769af0c265b6cda3ac1

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