Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa9826d3d05cc0eb…

MALICIOUS

PDF

72.9 KB Created: 2021-09-14 05:21:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 028cce6ef91ff0ab1ed20b63d548a6ba SHA-1: 0a18e2bc31956767d8f4fd0f8253d907e31c76c5 SHA-256: fa9826d3d05cc0eb97d6b6e9d720864f8a6afb7907cba4fa24329ad98a529198
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external sites, many of which appear to be part of a link farm designed to obscure the true destination. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a common tactic to evade static analysis. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://smidgel.ru/uplcv?utm_term=zarchiver+pro+apk+download PDF link annotation
    • http://biznesfishki.ru/files/userfiles/files/lewaxolabikejafaj.pdfIn PDF document text
    • http://stringladies.cz/userfiles/68719212061.pdfIn PDF document text
    • https://spotiverify.com/ci/userfiles/files/lefitiwuwegemuwuk.pdfIn PDF document text
    • http://abwlondonblvd.com/uploads/files/14734893252.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139c0641eab8---juzokuvesaful.pdfIn PDF document text
    • http://yibetter.com/data/files/12756383956.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139cd2a848bc---16432581426.pdfIn PDF document text
    • http://cngwalk.com/fckeditor/userfiles/image/5378412816.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b5029416e4---jigininubopoba.pdfIn PDF document text
    • http://zzzwchem.com/upload/files/89156184388.pdfIn PDF document text
    • https://theipbuzz.com/images/file/28153969279.pdfIn PDF document text
    • http://www.ufolep-69.com/contenus/files/48147692238.pdfIn PDF document text
    • http://hurtowniagrafit.pl/userfiles/file/bavimozabeviwaxe.pdfIn PDF document text
    • http://pegasomeeting.medcoast.net/ckfinder/userfiles/files/dorekusamiki.pdfIn PDF document text
    • http://cgmorenanews.com.br/ckfinder/userfiles/files/13283006635.pdfIn PDF document text
    • http://chineseclothingonline.net/File/95241333561.pdfIn PDF document text
    • http://full814.com/upload/files/runekiba.pdfIn PDF document text
    • http://www.horakgolf.cz/ckfinder/userfiles/files/75095294494.pdfIn PDF document text
    • http://www.macrolepidoptera.hu/userfiles/files/5699743541.pdfIn PDF document text
    • http://vivaibonomo.it/userfiles/files/zenujetuxewiruvivow.pdfIn PDF document text
    • http://unicorn-furnitures.com/d/files/dikezafuguduroto.pdfIn PDF document text
    • https://agri-mal.pl/userfiles/file/labuzuwurokisukonagupimo.pdfIn PDF document text
    • http://tomekorea.com/userData/board/file/12061388427.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_off0000ba88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA88 16768 bytes
SHA-256: 8ab366488179f4a720fb883121f0ee02157215069a73528996feb2c57ef6b1b7
font_01_sfnt_off0000e5e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fdf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF9 10552 bytes
SHA-256: b9cc170ce6544eb7ab00d8d9924a2d6e3f0538ef161c8f41abf71412d6042c1a

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