Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bc8fbfdddce2e19…

MALICIOUS

PDF

83.4 KB Created: 2021-09-16 20:50:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 377cbde1c2b7f63edfb3493357131530 SHA-1: 59a6ae80bfa606afcb8afc4d3efd37c2832e10c6 SHA-256: 5bc8fbfdddce2e19949a36c1a169d1b2fe07d3ffbc8592d3cf67713db9f5afd9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious. It contains numerous links to external PDFs hosted on compromised websites, indicating a link farm designed to distribute malicious content or facilitate phishing. The presence of these links suggests an attempt to lure users into downloading further payloads or visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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 https://kligi.viart.lt/ckfinder/userfiles/files/jatimusovewa.pdf In PDF document text
    • https://sts-cct.com/app/webroot/userfiles/files/nekaxopivutedax.pdfIn PDF document text
    • http://bretagne.annuaire-regional.com/ckfinder/userfiles/files/pekoromileroxaza.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bfe4ce8f5486fdf6213bc5480672b105/nukovalomami.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/172fe35b29bfad9e01fb2d4c238c2658/keximoto.pdfIn PDF document text
    • https://kangaroovietuc.vn/webroot/img/files/tamigekozefefutalolifemo.pdfIn PDF document text
    • https://dehayemek.net/upload/ckfinder/files/kimidupobuvazasujanigu.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/161342a5b912e7---vadibemolosi.pdfIn PDF document text
    • http://sgpeo.pl/users/file/kexegaluxuzudovebozafaki.pdfIn PDF document text
    • https://centaur.vri.cz/docs/files/bizeru.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/443337ea4a43b7f71167c03f3a0b878c.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/lurelesovamakigilez.pdfIn PDF document text
    • https://tekmaker.com/upload/files/47045060308.pdfIn PDF document text
    • http://cautrucpalang.vn/webroot/img/files/tajape.pdfIn PDF document text
    • https://incense888.com/uploads/files/202109071127244718.pdfIn PDF document text
    • http://snsi.jp/image/news_file/53705886198.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/m2cs8hkro04icase2f69u96n5h/nonemofitozexolavixive.pdfIn PDF document text
    • http://thietbimaugiao.vn/Images_upload/files/21536530205.pdfIn PDF document text
    • https://www.ventisilva.com.br/ckfinder/userfiles/files/ladubugutotoriwofaxarew.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb35c2049d---bewagal.pdfIn PDF document text
    • https://jogamiskolc.hu/ckfinder/userfiles/files/82112349035.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/73964379470.pdfIn PDF document text
    • http://zabbeleecooking.com/ckfinder/userfiles/files/timunis.pdfIn PDF document text
    • http://xn--80aafkatcapceshpicpg3h.xn--p1ai/pict/file/zetisifewab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=c%23+free+pdf+generatorPDF 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_off0000e88f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE88F 17772 bytes
SHA-256: b8665e7a36d07d678753dcd8899076e62aa27747093dfea1e5310af8b33a52f0
font_01_sfnt_off0001173c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1173C 9104 bytes
SHA-256: fe4a9ad32d6d12da45ce8861a1e6e511df5579fd33367a5c4d1c9e774d301804
font_02_sfnt_off00012a0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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