Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e5b98113c72fc3d…

MALICIOUS

PDF

81.9 KB Created: 2021-09-04 02:01:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3422fb4b15c96f4bc3c995a412ff444e SHA-1: c398d3978fc11148746ae809d05f40de5597a0e3 SHA-256: 4e5b98113c72fc3daff32bf2615515e56aa5ef75807b6a2afd4231a952ab3c3f
164 Risk Score

Malware Insights

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

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous external links, many pointing to compromised or disposable hosting, suggesting an attempt to redirect users to malicious content or download further payloads. The presence of a 'download button' heuristic further supports a social engineering lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://krisoc.ru/uplcv?utm_term=archi-graphic+an+infographic+look+at+architecture+pdf
    • http://szakkepzosiklos.hu/upload/file/69086847377.pdf
    • https://playworkspartnership.ca/sites/default/files/file/gurobapikutuvo.pdf
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaa2bd2d56a---bowafegosenejimiv.pdf
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d687e52f444---48944613636.pdf
    • http://agendatourvietnam.com/hinhanh/file/tojetunevumirilusetidaw.pdf
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/912b24fc52c4170a4542f0f5241efc78/runefudebosigimarakiv.pdf
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160aa62d596ab4---jebobavusijilivilirijil.pdf
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/ad5d190f6591f198a36668b31e816b43/25555559232.pdf
    • http://xfswchem.com/upload/files/xuseferut.pdf
    • https://tidaksusah.com/contents//files/dilogenanulikatitigo.pdf
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a4894db6323---76832924493.pdf
    • https://almoheetmanpower.com/public_html/userfiles/file/pewawarapa.pdf
    • https://mimpiindah1.com/contents//files/25200633.pdf
    • http://damnoen.com/ckfinder/pho/files/zozegalideremalut.pdf
    • https://cedria.es/DOCUMENTS/FotosFCKEditor/file/pelusadezoratop.pdf
    • http://ingenermarket.ru/userfiles/63183293562.pdf
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/2628d84d00c4ab1e86bd43e60eec9ee5/japoxawidubow.pdf
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c13316ec53a---67744961410.pdf
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607623a104f99---sonugi.pdf
    • http://decamiones.com/userfiles/file/detenero.pdf
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/vj92ocmkdm0a66afpajin0g2k5/17518979159.pdf
    • http://onnetsolution.in/userfiles/file/42320987927.pdf
    • http://seanmore.com/userData/board/file/30008852653.pdf
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/53647610330.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5ed.bin
35e993362aae6d1b5000be4d207eb948ed42e467f9ee9083ac0007d48d1d691e
pdf-font-stream PDF embedded font (sfnt) at offset 0xD5ED 19676 bytes
font_01_sfnt_off00010899.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10899 16792 bytes
font_02_sfnt_off000120b0.bin
536933a565bf2494be6182a64cabb896fb38aaa52671f61422e0369335f73034
pdf-font-stream PDF embedded font (sfnt) at offset 0x120B0 10940 bytes