Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bc779f6de3e6835…

MALICIOUS

PDF

93.6 KB Created: 2021-06-26 00:03:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 19eb430607e07a36740619bd1dc8b721 SHA-1: 91aefbdac25416f9ceb51357bd30ce301d3e2080 SHA-256: 1bc779f6de3e6835adb96d6c53244437b2487630fcdeab908b42544955946e8a
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL analysis strongly suggest a malicious intent to redirect users.

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 http://onellenorzes.com/uploads/files/botoxijogox.pdf
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/b20521ef632f1c307056fd418972d0c4/87678731002.pdf
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6d3ca7b77---vanubojonogilewatumu.pdf
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b866ab6d122---vuzobikex.pdf
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074701c00f9f---fusefuku.pdf
    • https://irisapp.cn/uploadfiles/fckeditor/20210521/file/16216044969934.pdf
    • https://realschoolspirit.net/scauserfiles/files/fowoxo.pdf
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/c0d1d3ba219265957705b612885734bd/11670541035.pdf
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a177bd3fbfa---22104612128.pdf
    • http://ttlh.vn/storage/ckfinder/files/geposowi.pdf
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ccdcbb5e5---45638112049.pdf
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a784c1536b9---64326277223.pdf
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/35d0568a0bd189fba2ff407ee0f074f1/84132965257.pdf
    • https://stopserv.ru/files/file/zegoninudopiwosizakubi.pdf
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf379592476---dosuseduluzemexegejamesad.pdf
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160732e1770858---tujuvigawuziwoxin.pdf
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607594cd5a708---36948993052.pdf
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/b5j5kfgvnc6vdmate4mmq2goq2/27255559252.pdf
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072e28b7b84e---roxesajusajunileme.pdf
    • http://dioceseofniranam.org/userfiles/file/nosazenojezagirasokun.pdf
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/8d2bcba7b66fa412da25857729eb27cd/69989370647.pdf
    • http://sungwoneng.com/upfile_editor/2021/files/20029472682.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=sonic+after+the+sequel+omega+download
    • 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_off0000f906.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF906 16792 bytes
font_01_sfnt_off0001111d.bin
7a82bb768cc02ab3761490a242ef9697a3dfcabc00ac587a2386ab2b82bdb24b
pdf-font-stream PDF embedded font (sfnt) at offset 0x1111D 11328 bytes
font_02_sfnt_off00012b18.bin
7630252c6cce0b8dbbb1defb0fe8f067ea1e4d99025db72061198499c8d0c0ab
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B18 25452 bytes