Malicious PDF — malware analysis report

Static analysis result for SHA-256 1074f21bf54cf533…

MALICIOUS

PDF

87.3 KB Created: 2021-09-16 01:34:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 15a7eb427f7384a4a83af85c8a39da9d SHA-1: 17cfb9650e199021a6937ab5721a8c9e71c53766 SHA-256: 1074f21bf54cf533f25bd51658f133419677f1f751a5d23b6ca7c99b5e6cfbdc
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS upload storage and disposable hosting. The embedded URLs suggest an attempt to direct users to external, potentially malicious, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9807

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://houstontca.org/Content/uploads/files/36140929711.pdf
    • http://ch-bovi.com/upload/files/25456803179.pdf
    • http://neoclassicalmansions.com/uplds/file/jafazazu.pdf
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614245a91ee44---88047074058.pdf
    • http://rsport.eu/yonexshop/static/file/lawitolu.pdf
    • https://grouptm2.com/contents/files/mimapapopew.pdf
    • http://muasamhangmy.com/ckfinder/userfiles/files/dujaxotebotobobupir.pdf
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16142721f33c3e---88214211753.pdf
    • http://ageofwonders.buka.ru/sadm_files/pijesivasuni.pdf
    • https://interstudy.net/userfiles/file/27010391402.pdf
    • https://hongmao.tw/uploads/files/202109020359463054.pdf
    • https://www.bbmnetlicitacoes.com.br/cms/ckfinder/upload/files/77036466666.pdf
    • http://tplustech.com/images/ckeditor/files/28730102639.pdf
    • https://nezamirekhaseafoods.com/userfiles/file/34627984421.pdf
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613b16051c7a1---julomilimevokaramepiduji.pdf
    • http://giaydantuongphongkhach.net/images/news/file/61898162573.pdf
    • https://orig-shop-gsm.ro/ckfinder/userfiles/files/23687260809.pdf
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/22312901c1360eb64960af5ee90ea177/zebawavujufufozi.pdf
    • http://vngo-cc.vn/cooker/public/files/fidaromagipukip.pdf
    • http://thuduchouse.vn/pics/file/zawezolukenegifuxoratakug.pdf
    • http://likebarcode.com/image/files/20210911_013844.pdf
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/16137a7919186f---17256409629.pdf
    • http://thesciencenetwork.org/uploads/files/sawaxalegosabaxapekugut.pdf
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/161350a7887a18---fuwumegebarobujekid.pdf
    • http://ruresept.ru/files/file/sawivux.pdf
    • http://deltools.com/userfiles/file/48395792987.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=gear+s2+rebooting
    • 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_off0000cea4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCEA4 16792 bytes
font_01_sfnt_off0000e6bb.bin
7689c92da4aa14735c16c001c966abb857814cc5735f1716e45d3af535f87585
pdf-font-stream PDF embedded font (sfnt) at offset 0xE6BB 10536 bytes
font_02_sfnt_off0000fef2.bin
ac2e59740f29c6c2e0a7db10b37ac60e5f928fde195c33e50a660455860cd406
pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF2 22024 bytes
font_03_sfnt_off0001378a.bin
e06ebeaa2bb94d9bf14337b0794fec2c9c4a66e30291689b6f6234bfe360c8a5
pdf-font-stream PDF embedded font (sfnt) at offset 0x1378A 16232 bytes