Malicious PDF — malware analysis report

Static analysis result for SHA-256 1557a2c20a49bf6e…

MALICIOUS

PDF

74.7 KB Created: 2021-09-05 17:08:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 72d9647615a212e85ceac2a45edbb1aa SHA-1: 7106565b75a2112f6867f46c340fbd2012e2836b SHA-256: 1557a2c20a49bf6eb9d16902828173f27441116bec56b219639a06bc6ac31538
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing and trojan delivery mechanism. It contains numerous links to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute further malicious content. The presence of a 'download button' lure reinforces the phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://pixomot.ru/uplcv?utm_term=pdf+to+docx+converter+ocr PDF link annotation
    • http://positiveforce.in/uploads/files/9194899266.pdfIn PDF document text
    • http://kovove-ploty-brany-zabradli.cz/UserFiles/File/zaxujuloradozerofisal.pdfIn PDF document text
    • http://jyotiacademicpress.org/uploads/file/fumevogurepo.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8360955e1f---15857065339.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608350301957f---dumadogawi.pdfIn PDF document text
    • http://smit-electronic.hr/upload/datoteke/gowowirezilize.pdfIn PDF document text
    • http://bookblog.kr/data/file/files/63527337528.pdfIn PDF document text
    • https://questyme.com/userfiles/file/wikazebobok.pdfIn PDF document text
    • http://studiorumeo.it/userfiles/files/negazanomuv.pdfIn PDF document text
    • http://prime-standard.com/piceditor/file/93813664685.pdfIn PDF document text
    • https://autoroman-service.ro/imagini_ws/62006408264.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089d5760e7ee---54111707467.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ireer9jnihud59kan83ipenft1/34397018469.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/cd848522495ba9935559df65ef602bf9/12154605189.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/508d725a45a025698d944c972803f7a3/21394906107.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6436c49a2---45612004940.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/6c8ik84htockpqu0b4d57gulg2/26662023333.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c79df646dbf---3583613770.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4775b9a607---sajifikamujigaxo.pdfIn PDF document text
    • http://gocreate.termall.pl/upload/fck/file/waxazoworawamesej.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/kusifarigilakagifivemu.pdfIn PDF document text
    • http://biomassasia.net/data_ed/userfiles/file/lezexiwijijesoxosixu.pdfIn PDF document text
    • http://autohondl.cz/userfiles/file/magiridutamigavujed.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160733a1bb2a21---xabur.pdfIn PDF document text
    • https://paeonia.ch/userfiles/files/fujidinokomititax.pdfIn PDF document text
    • 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_off0000c37d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC37D 16504 bytes
SHA-256: 45c92c279edd7e4488b30a288e9b3eb3229f79aa351e7da8a8eeb2c39cdc4ed1
font_01_sfnt_off0000ee14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE14 10168 bytes
SHA-256: b78b7a351b2e36f07d2bcddc489d087b7db5691686d0070810d10a07ae5e4dc8
font_02_sfnt_off000104fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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