Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d58f879516daae9…

MALICIOUS

PDF

72.2 KB Created: 2021-09-10 01:23:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f78695ca0e2e8eb6f21e3e3750a3814c SHA-1: 4f7c949d041d3f43d91e62290afe383560afb07b SHA-256: 3d58f879516daae960f068eaaeb26c21e66d5fe203dbe6470db23847d9105c4c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised or unknown domains, likely for malware distribution or phishing. The presence of numerous embedded URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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 http://jvcc.cn/ckfinder/userfiles/files/210904020217742483sye4c.pdf
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613616bf0a58f---45343639157.pdf
    • http://levne-pohary.cz/UserFiles/File/butasekaxesezazojuna.pdf
    • http://mgtofubbq.com/uploads/files/zixofaruvusatirem.pdf
    • http://darangyi.com/userData/board/file/zowudelumogusefiruseli.pdf
    • http://mycoapaisyl.com/webimages/files/32337107404.pdf
    • https://y3stwk65l-mn9.com/contents/files/busuzituv.pdf
    • http://www.museopizarra.com/ckfinder/userfiles/files/44281645016.pdf
    • http://wenyanchem.com/upload/files/wotadiwenik.pdf
    • http://alexlunacoach.com/img/editor/file/raluf.pdf
    • http://ejmk.com/ej/upload/files/13644157971.pdf
    • http://travellightnepal.com/userfiles/file/28784038044.pdf
    • http://3q1p.com/upload/file/210905112517259501ou2uv2z9ty60.pdf
    • http://www.arborvitae.cz/ckfinder/userfiles/files/ratulubugej.pdf
    • http://machinegroup.ru/img/outer/files/ponorovikatisarujosixadig.pdf
    • http://cephedanismani.com/images/pages/file/gurosuvitodur.pdf
    • https://uclerbaklava.com/resources/file/40305081839.pdf
    • http://piri-piri.pl/ckfinder/userfiles/files/67311560188.pdf
    • http://ddservice-bmw.pl/userfiles/file/mutibokejirodoguzani.pdf
    • http://shijijiaming.net/filespath/files/20210909053657.pdf
    • https://kuepancong.com/contents/files/gugefobunu.pdf
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1612f368030539---sazidorilotagovixikow.pdf
    • http://aaaexpressac.com/userfiles/file/29117406986.pdf
    • https://alyosserspneed.com/userfiles/files/wakuburibofab.pdf
    • http://islandpointfl.com/userimages/rabegebidasixige.pdf
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613019c6ba429---67130837297.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=android+install+apks
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ba7a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBA7A 16792 bytes
font_01_sfnt_off0000d291.bin
3bdca4df6b8c2a7c7be95172e5067f525bdacfca0abf1175817e5c8f8380d762		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD291 10328 bytes
font_02_sfnt_off0000e9ee.bin
75f23f064b27c53295da1b3414bc603e1531c82c1a765c7cad37cc6e297afb60		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9EE 15928 bytes

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