Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f5a6b44d2922993…

MALICIOUS

PDF

84.9 KB Created: 2021-07-09 22:24:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0816c971330b580484f5baee938d203b SHA-1: 340efaed9400e043fc9b1ec97af8c06c2b129e85 SHA-256: 5f5a6b44d2922993f55783125b52a47995c28e4fb153e2f0fc20c2f830d0836f
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous external URLs pointing to potentially compromised WordPress sites and other disposable hosting. These links likely serve as lures for phishing attacks or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/92l2ee9smhldd6n7fg0v6oajfr/78883194614.pdf
    • https://birudongker.com/contents//files/mafabademaxatarobugowow.pdf
    • http://hytechplus.com/userfiles/file/vejazobedibotitudut.pdf
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608c775fc4d19---bujavevi.pdf
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076e3012a25b---32036824754.pdf
    • http://penzionriverside.cz/files/file/29856553960.pdf
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d0c5b295e4b---69920922502.pdf
    • http://adacu.org/userfiles/file/20210704122250.pdf
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1c7807bd1---ruvopitosuridineweni.pdf
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/a08253012d55cbd96b0ea3c3e1bbcaf3/94682729059.pdf
    • https://farmaciasacoor.com/site/upload/file/3028640608.pdf
    • http://gianphoiduyloimodel.com/Images_upload/files/43249032664.pdf
    • http://dokumsuzgec.com/userfiles/files/85211775284.pdf
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/c626c03f44f18daca40a97bee8de3051/tiziluwobobonesuwo.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/76v35ubnao3h5nbnmlo6ejji14/65522420168.pdf
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16097cd2279b46---vewaxugilutuki.pdf
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a09f284e849---12942270714.pdf
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/4c330462cbd78449d9767aa015a571e7/zenilevezepokitonulelobur.pdf
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609f109fdf3ce---wavasofagubixe.pdf
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/048f87b174117781d990ed3e9acc438d/97281640911.pdf
    • https://perfecthospital.org/FCKeditor/file/butufatimerutavoxoduni.pdf
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076ab7dee3db---72013771299.pdf
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2ca6edde65---36278014671.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=rindercella+slopped+her+dripper
    • 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_off0000ea10.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA10 16792 bytes
font_01_sfnt_off00010227.bin
95f318c561fd0a289d226e30882b1e824a75f2a27d5def3434efe96fe39772d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10227 10556 bytes
font_02_sfnt_off00011a0c.bin
cfe5babe83273e1a3ad353e1887001da8608f8d9e178fb258ab1c268bc56cb02		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A0C 17196 bytes

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