Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e9e93360b75bb70…

MALICIOUS

PDF

87.7 KB Created: 2021-07-20 22:41:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2f2ea6f10c7d55c6ba804f7e46a25956 SHA-1: 8598ababe67567d94c3cf67fe1a37e479f5da99a SHA-256: 6e9e93360b75bb707667af5e56c3e9047b7f5abbaebafcf02f5d8b41b7410e74
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous external websites, some of which are hosted on compromised CMS upload directories. The presence of embedded URLs and the PDF structure suggest it is designed to lure users to potentially malicious sites, likely as part of a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://sunrui-ti.com/d/files/petuxijegosazavep.pdf
    • http://www.ujepites.hu/userfiles/files/35658779492.pdf
    • http://influences-vegetales.eu/assets/Image//files/butazowasedilegezap.pdf
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/897d256d5c9db353cbde214a6c983f78/58414624692.pdf
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acf22b4140b---pategudawovowisudaseti.pdf
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/93ce14c0b1c1775e94b2083f6b063949/bazotujuzizakuvo.pdf
    • https://watfordfairtrade.org/app/webroot/img/files/24218049226.pdf
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3c5b0aba75---zumisuzufa.pdf
    • https://dovolena-jiznicechy.cz/uploads/lidosotugejefujogudalu.pdf
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/1beecf205788b4623a47484c66a844e4/junekakaxovugovajiv.pdf
    • http://www.medicellbank.com/userfiles/files/59688718721.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/730c16a83400ee9f96603c88d4d95e37/widirobevozolixafatage.pdf
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/484444eba7cb8df9aa95c22b856da812/gitojuxirotiwibiwazatigap.pdf
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/382d2sttdi81jfaltmbsssq3df/32115323859.pdf
    • http://alpinist.store/sribati/editor/uploadfiles/989870873.pdf
    • https://artasedanasingaraja.com/uploadfck/file/kesumevusuwebowo.pdf
    • https://htchninc.com/d/files/54972797053.pdf
    • http://daotaonhaccong.com/uploads/userfiles/file/xotitikebezi.pdf
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f95ebebd56---41882170627.pdf
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/4lpoc5d1e9k40bl6nsefci23k0/78094055985.pdf
    • https://turdv.ru/SITE/files/editor/file/91851952079.pdf
    • https://thekolkatapackersmovers.com/ckfinder/userfiles/files/39360531882.pdf
    • http://indianspringhomes.net/userfiles/files/nopezikotadofinafejuboti.pdf
    • http://katyababash.com/images/uploads/file/fezarivuroxom.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=stardew+valley+best+layout+for+sprinklers
    • 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_off0000f214.bin
6bebf1bb1387eab52eb0050f2f6428f6bbf5283714e1914d71364d73b0aecd13
pdf-font-stream PDF embedded font (sfnt) at offset 0xF214 17156 bytes
font_01_sfnt_off00011ee6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE6 16792 bytes
font_02_sfnt_off000136fd.bin
bf8658dbb17926b6f6a9bd19f2bc6a464d93c49656ab9426346c3203fb3252b0
pdf-font-stream PDF embedded font (sfnt) at offset 0x136FD 11164 bytes