Malicious PDF — malware analysis report

Static analysis result for SHA-256 8165d08f9dc74d03…

MALICIOUS

PDF

83.0 KB Created: 2021-07-30 21:47:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 41d9aabf20f15b78eb024c2e7ee022f2 SHA-1: b3659090031200714f683f6af333aa17a01bfcf9 SHA-256: 8165d08f9dc74d03059767ea95cf30e441f8abaeb0b388e5213b6ac5223532b6
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external websites, many of which are hosted on potentially compromised or disposable domains. The presence of numerous unknown URLs suggests an attempt to distribute phishing content or further malware payloads.

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 http://kuresi-kaitori.com/upload/content_pic/files/2439694486.pdf
    • http://amirafouad.com/uploaded_files/file/nawulalikuzunevijub.pdf
    • http://haverfordhigh77.com/clients/e/e7/e7c5a96ea35a64a1345a575153f12e7e/File/93755658905.pdf
    • http://washchienluoc.com/upload/file/gokenimememijasugozigezug.pdf
    • http://chinalabware.es/d/files/67018690180.pdf
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/vst1aqb54fadgfcogcb4afbmua/pudetesi.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/3f2u4sj3jegmaod22mn8a69jg1/61405998339.pdf
    • http://kartywspomnien.pl/uploads/assets/file/2464856852.pdf
    • http://tuzvedo.hu/elemek/file/zitidugupoluwa.pdf
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160944ee15c84c---bepogatebopebomupagemalix.pdf
    • http://iglozawiercie.pl/zdjecia/file/paremevaperado.pdf
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/69def14b71250bd93d361603e11e0724/2361034520.pdf
    • http://aj-logistics.com/stock/userfiles/file/suxegaw.pdf
    • http://insfilings.com/skyzone_classic/upload/files/54391650812.pdf
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/dfaba82u7t1asr8t8fl2p9hlmv/zemiperilutuvobigukom.pdf
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/c0f2c80c18eb748b28681500eee59b75/56303687774.pdf
    • https://diaochue.vn/userfiles/file/41841015641.pdf
    • http://hzzxtl.com/UploadFile/file/20210626193701686.pdf
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/1968579007c8aa410d15a9ab6adbe5a0/zibirirumog.pdf
    • http://macabrey-luthier.fr/data/Files/merisozubilazazumezaxanob.pdf
    • https://laatjehuisweerstralen.nl/upload/file/45003363412.pdf
    • https://mps-india.com/userfiles/files/21807350451.pdf
    • http://omegapizza.net/uploads/files/xosarodifikolivab.pdf
    • http://hotelstrack.com/bot/ckfinder/uf/files/vosotozuranereboki.pdf
    • http://kosmonautika.ee/ckfinder/userfiles/files/2210169136.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+reset+a+dewalt+20v+battery
    • 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_off0000e25b.bin
6b01d4bd549ebe35b48a4dc00ff036e1d5b997c536ef2f632faefc7fd9b82611
pdf-font-stream PDF embedded font (sfnt) at offset 0xE25B 10684 bytes
font_01_sfnt_off0000fb19.bin
0972d13ddf22da2d4c7758fcb1ba92cdca8515811f9b81cc3acfbc41796126f8
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB19 16656 bytes
font_02_sfnt_off00012610.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12610 16792 bytes