Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd727e63a30b4e3b…

MALICIOUS

PDF

78.5 KB Created: 2021-07-19 10:50:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 04d9c67190550f1efe36cafa876e5636 SHA-1: 2b8649110d3adc8a5ecee60dc31de74cd577c533 SHA-256: bd727e63a30b4e3b3b8c686902417448a35887b39814f13ba623722219d5073e
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with multiple URLs pointing to compromised CMS upload directories and disposable hosting. These links likely serve as a lure to redirect users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160834554330b8---lukagoz.pdf
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b8ad67bce6f---13934970286.pdf
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/320bea00809d29f2b875aa2841612a03/rusakefogesaxifi.pdf
    • http://bet-balance.com/userfiles/file/wibuwosuf.pdf
    • http://polskienarty.pl/data/aktualnosci_imgs/file/24702229130.pdf
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160729834cbe96---62695267183.pdf
    • https://royal-art.pl/uploads/userfiles/files/82783700826.pdf
    • https://motty-etai-sharon.com/files/files/53874420962.pdf
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/tmukm9dv3fr1de6i7u7utecuee/34723083431.pdf
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096761842926---nikijabofi.pdf
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/hibt8rf6r3ram2h5rcikn3b6jf/46448487204.pdf
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607273a1d091f---10846462274.pdf
    • http://jvcc.cn/ckfinder/userfiles/files/2106041919042674273cgoe.pdf
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/a1979ae7166ed1390ee6f4fa948bcd19/24871011534.pdf
    • http://tcurryproperties.com/konadnew/userfiles/file/zomefegebosadazu.pdf
    • http://cec-intl.ru/app/webroot/files/file/79277038936.pdf
    • http://nghiencuuykhoa.com/uploads/userfiles/file/29468597013.pdf
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/9sn3g8u0nbla753b1rq2ijs1k0/betosuxedaki.pdf
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/04pocf3tsinrl1lkruskpmhss5/zaxug.pdf
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16091f6b0e728b---53462084904.pdf
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/8mcd2ja094rlkt3covf9ge0kt5/wemifubakifufirotil.pdf
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/366fd669403c170dfff4f29dc989d349/35779667664.pdf
    • http://arniestribu.com/campannas/file/gikurixiwul.pdf
    • http://temple.mo/userfiles/file/10152711122.pdf
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d4db5692545---fikufugetaliwutapepopab.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=the+karate+kid+part+2+soundtrack
    • 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_off0000c9e0.bin
c2baf495314821f065985bc459524cd221d4d7c9763983dc4400d6c7a8badcac
pdf-font-stream PDF embedded font (sfnt) at offset 0xC9E0 10840 bytes
font_01_sfnt_off0000e2f2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F2 16792 bytes
font_02_sfnt_off0000fb04.bin
c62f42f5a7533dfa646882573f9b2bc0cc15bebb1ad169da7e56fd3df75bf1ca
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB04 18896 bytes