Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a21b33bb64a5ba6…

MALICIOUS

PDF

83.7 KB Created: 2021-09-14 14:26:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a71e47c9fe81b494eb4ce2a9781820e8 SHA-1: 0a5fa0a1a22d0dc3285309b8b7d75c39df149160 SHA-256: 8a21b33bb64a5ba6b9c0aded2c4a672b7f34ad2880ad19f023c33e0f0ca724fa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. The document contains a link farm pointing to multiple domains, some of which are hosted on compromised CMS upload directories, suggesting an attempt to distribute malware. The presence of external URIs and link farms indicates a likely spearphishing attachment delivery vector, aiming to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://eortak.com/img/fck_temp/file/kowiwovixobelaxo.pdf In PDF document text
    • http://bobas24.pl/Upload/file/38276413073.pdfIn PDF document text
    • http://landonintergroup.com/ckfinder/userfiles/files/xikar.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613122e0dc35a---28588742226.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/94748535d286d4f20d0407982ba19e58/somuji.pdfIn PDF document text
    • http://erbaytag.com/resimler/files/puvov.pdfIn PDF document text
    • http://go-pxl.com/uploads/files/72007459577.pdfIn PDF document text
    • https://kitapkapla.com/upload/ckfinder/files/dizonu.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/3f07618b43efd02e9b4463e23fd13972/vodekosadigebuxamixilusag.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/35727170662.pdfIn PDF document text
    • http://vlajamo.cz/images/file/gefezopagubudepuv.pdfIn PDF document text
    • http://suncitygroup.ir/basefile/suncitygroupir/files/70271336207.pdfIn PDF document text
    • http://sovaimm.it/userfiles/files/filotifowoguk.pdfIn PDF document text
    • https://aqua2go.pl/galeria/file/94055885859.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/161384149118bd---buruxifusilajovejorapo.pdfIn PDF document text
    • http://nhatminhtrading.vn/app/webroot/uploads/files/dapukusijilefisob.pdfIn PDF document text
    • http://humanlitech.com/files/files/96020624186.pdfIn PDF document text
    • http://smsgurugram.com/miet/assets/files/92972988233.pdfIn PDF document text
    • http://matsusushionline.com/uploads/files/tosufefuragujimadepeg.pdfIn PDF document text
    • http://yenidenyuzlendirme.com/ckfinder/userfiles/files/86152040768.pdfIn PDF document text
    • https://vientangluc.com/upload/files/sekopotezoxederimamuro.pdfIn PDF document text
    • http://e-motyle.natura2000.pl/imgturysta/files/fatavuxererezifate.pdfIn PDF document text
    • http://bedrucken24.de/userfiles/file/rurux.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16136d4d247f61---72570439627.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=play+store+apk+last+versionPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB0E 10520 bytes
SHA-256: 425f78555467e76e8d9ec949ed67bebed30e6da46d5dae2e56b4e28feb4b9eb1
font_02_sfnt_off00011336.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11336 17528 bytes
SHA-256: 89f73141f0fb1d628ddde509b7584ec59846a800c6b75b95ea8a47d91e1699d5

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