Malicious PDF — malware analysis report

Static analysis result for SHA-256 4436b764f2b00454…

MALICIOUS

PDF

94.6 KB Created: 2021-08-05 15:27:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6a5e12dbf68276bdb5c7baa6c3d807bf SHA-1: 816ce546f0ad892469de127b2df6ffc50bc0b19f SHA-256: 4436b764f2b0045447666ad69c859f65d3e02cdb326a7ce028c0f616248d0636
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users to malicious content. ClamAV detection as 'Pdf.Phishing.Trojan' and ML classification strongly suggest malicious intent. While no scripts were extracted, the structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/53d5a808ca4bce76c551c7e1637a87b5/64712376946.pdf
    • http://baohanhranghm.com/upload/img/files/gudutibuzowobaze.pdf
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/77fa0b92ef6c88926da0e551a76f2599/28672861580.pdf
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/193687e477a9898216e2ae4ef7e696e8/potoxojuxe.pdf
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160d6dfa6099a2---lanivixexeminelovo.pdf
    • https://produktybhp.pl/pliki_user/File/6882535413.pdf
    • http://steakclubhn.com/campannas/file/javituwezoxudukabojow.pdf
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/b1f61df6273143b4c832e32c831412e7/86728276902.pdf
    • http://francescasciortino.it/userfiles/files/fugujukelurelinusepe.pdf
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/1c1377ed5a8802a8787d8c7eb020105e/solasulimemojevereg.pdf
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983d4a2d5c3---rusepolimulukokeg.pdf
    • http://hccc252.ca/clients/e/e4/e484b38507f190a955b66748903449e1/File/zuxexavonewurefawotonoton.pdf
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160aa5b8c2159b---butixidiwawukelusulekipe.pdf
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/5bb99a6ddf684ac88d32ce74d64c6663/40909856904.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/elpng53lmj17l4hu093koed6l0/32273212494.pdf
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/5orvmlqhbjon8047qi11nc3ld2/sabovegirawim.pdf
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16070b266e4997---kefano.pdf
    • http://www.wm-meyer.de/meyer/admin/editor/ckfinder/userfiles/files/repig.pdf
    • http://usagimatur.com/files/others/31641254909.pdf
    • http://chi-kara.net/userfiles/file/29918943872.pdf
    • https://cambodiadriverservice.com/userfiles/file/votovejigu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=an+introduction+to+english+literature+fran%C3%A7oise+grellet+pdf
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/eb826313118d687ddc4c3264617f22d4/molafu.pdf
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e891f799d01---74347843746.pdf
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb78.bin
2a782923c6f7ef9a234587cb524bf7ad574d4ff6563d9beaea611ba6ac3a74e9
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB78 19904 bytes
font_01_sfnt_off00012de9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12DE9 16792 bytes
font_02_sfnt_off00014600.bin
af40b95a4db70b946d6f7e0421cd76f16261a3eba8aeaae95c0fe5cad1df2dae
pdf-font-stream PDF embedded font (sfnt) at offset 0x14600 11180 bytes
font_03_sfnt_off00015f94.bin
512ba2b6c1e29750ac6d8264287eaa93e05727afd5ebd968babeff07207ae28d
pdf-font-stream PDF embedded font (sfnt) at offset 0x15F94 1964 bytes