Malicious PDF — malware analysis report

Static analysis result for SHA-256 e45ab26446d13a25…

MALICIOUS

PDF

71.2 KB Created: 2021-09-04 15:24:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a910d44d2616de1bc2f594add861fc93 SHA-1: bfe30dc461d22336b6302eaf03d4d6efabbcea1b SHA-256: e45ab26446d13a25afbc53cac130c32d61ed5bce53a4cf5dbd5fb77eed634d71
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. The PDF also contains numerous links to external websites, many hosted on compromised WordPress sites, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/84242ad397dcc69b6255bc89572e6594/fepetumener.pdf
    • http://mikailang.net/userfiles/file/20210604155831_127446741.pdf
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eda744396a---batirurefafudelikosakus.pdf
    • https://starwebline.com/calisma2/files/uploads/zozobewajev.pdf
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6b3f7d3d90---67425549034.pdf
    • https://advantagelic.com/singhania/downloads/file/fagenagakasu.pdf
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/a371ff7870f35a4aef60c1ee5f0c2963/61657933625.pdf
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607689620ec50---tijok.pdf
    • http://tsutae-f.com/js/upload/files/sejuseverafujigo.pdf
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160fa0b7c6608d---bunovo.pdf
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/d1de8e7db728689b35dfe47ae350b095/pedubebajazasusixuxowapiw.pdf
    • http://weymouthhighschoolclassof62.com/clients/5/50/50fe23896e84432c97ff20d680692bb9/File/2390714828.pdf
    • https://autoskola-scp.com/files/3899457852.pdf
    • http://macphersonproperties.com/clients/876251/File/pujebaforugufafefewi.pdf
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160922acf5c2d7---86506552219.pdf
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bf1f7867966---79244870719.pdf
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a1657c34b8b---fimad.pdf
    • http://2sisaccount.com/userfiles/files/72561611382.pdf
    • https://nothingbutsafetyglasses.com/userfiles/file/vumoxopijagitiwizufomimu.pdf
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16078335c12526---8512340793.pdf
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072575f85840---zadikakunodinazulo.pdf
    • http://upsshop.ru/ckfinder/userfiles/files/sijunowexovipej.pdf
    • http://jmestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lifipimexezufogulojameg.pdf
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/61f716dbb4537013d268526e150b3f1a/16989814431.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=glutton+berserker+novela+pdf
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/8cb038e80eb6ee1ef6d8ceb281c725d9/6568497062.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_off0000b780.bin
31d13280ff5ea0732417d59340ce9d9211eac4b8ca4440201bc5d9f18852f08b
pdf-font-stream PDF embedded font (sfnt) at offset 0xB780 10836 bytes
font_01_sfnt_off0000d084.bin
edc7884fd5eaa8b3d6fd0365cf027555273c88fac33023bf6996e4a89a2d75ad
pdf-font-stream PDF embedded font (sfnt) at offset 0xD084 14872 bytes
font_02_sfnt_off0000f568.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF568 16792 bytes