Malicious PDF — malware analysis report

Static analysis result for SHA-256 be873ad4954e4523…

MALICIOUS

PDF

83.8 KB Created: 2021-09-19 13:11:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: af9af75efdb87549f66e59f6014457dd SHA-1: dcbbba1d08f3e4696f085c8c6039c6ad1e32c67c SHA-256: be873ad4954e4523c4b9457d3cbd0a8cbab1d76b1a4b3e14fd7940c437783b4b
196 Risk Score

Malware Insights

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

The sample is identified as a malicious PDF by ML classifiers and ClamAV, exhibiting characteristics of an advance-fee scam. It contains numerous links, many pointing to disposable hosting or compromised CMS uploads, suggesting an attempt to distribute further malicious content or phish users. While no scripts were directly extracted, the PDF structure and heuristic firings strongly indicate a social engineering lure for financial fraud.

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
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://nikolsbeauty.com/webroot/f/uploads/file/dusopodesit.pdf
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/77a7645e670e4188289348396d4ae2e1/2306455099.pdf
    • http://broadgatecapital.com/userfiles/file/61714189831.pdf
    • http://dogomanhnghia.com/uploads/files/regemelobutero.pdf
    • http://ekopaczka.pl/imgbrama/files/fasabofagodelope.pdf
    • http://unicorn-furnitures.com/d/files/puburudebatiwofaxa.pdf
    • http://sgadsahodayatarntaran.org/sahodyatarntarannew/userfiles/file/41134192473.pdf
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16130c69cd567d---25378659468.pdf
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/8690c9d751c4ef4b8521dafcac912b13/91386620557.pdf
    • http://indemo.pl/Image/files/megolemavosipusasek.pdf
    • https://nepaltrekkinginhimalaya.com/assets/userfiles/files/luxarudifigunegizuk.pdf
    • https://www.hkfew.org.hk/ckfinder/userfiles/files/36069813910.pdf
    • http://xy-interior.com/uploads/files/202109120100309245.pdf
    • https://fiscalonline.ro/app/webroot/files/userfiles/files/kipotaw.pdf
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16139a4ebdaa89---65938762648.pdf
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/5088710778.pdf
    • https://systematix.pl/userfiles/file/17240297073.pdf
    • https://clic-essc.ch/ck/ckfinder/userfiles/files/65907515453.pdf
    • https://ubk-sad.de/azubi/userfiles/files/75674354324.pdf
    • http://bigcool.net/webroot/img/files/givugiredaboloxamaja.pdf
    • http://www.tm-africa.com/beta/public/uploads/cms_filescms_files/vogovog.pdf
    • https://eijo.in/ckfinder/userfiles/files/jibaboneferufujub.pdf
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/gudowobixebimejifaxomat.pdf
    • http://888chji.com/userfiles/files/motoxatavedodevij.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=my+phone+windows+10+android
    • 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_off0000e1c8.bin
cbfb15e15a070bc71f028a45967f318f79b9539d8258caba5ea95893553dcd79
pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C8 18204 bytes
font_01_sfnt_off00011162.bin
e87eb6965331c2919b9c1cd800aa026d42cf38a5d539d570436067879a5c14c2
pdf-font-stream PDF embedded font (sfnt) at offset 0x11162 10712 bytes
font_02_sfnt_off00012a02.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A02 16792 bytes