Malicious PDF — malware analysis report

Static analysis result for SHA-256 89a7c5cc90ba89ba…

MALICIOUS

PDF

74.8 KB Created: 2021-09-16 23:27:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1428eda8bb2854770348be40dd874034 SHA-1: e87173d30c474e6c08a05d8651ef81a456f35db2 SHA-256: 89a7c5cc90ba89bab3b7b520a7986fa489c34c4734c96e0a394e94a5e4f71fb6
136 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm for SEO poisoning or malware distribution. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the presence of multiple suspicious URLs suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • 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://inwebjor.ru/uplcv?utm_term=magic+followers+mod+apk+unlimited+coins PDF link annotation
    • http://africareview.in/userfiles/file/57394132567.pdfIn PDF document text
    • https://xn--q3cceuw0c6ab0d2ii.com/upload_file/files/83614965932.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/82726419237.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1612ebbb5e887b---rimijaro.pdfIn PDF document text
    • http://chrisdepanneservices.com/Sites/cds/files/lokofeno.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/ed9b86deb47b508ffe59d31414cbd3c5/xadudesegovujotunefekun.pdfIn PDF document text
    • http://pet.nfe.go.th/m_site/ckfinder/userfiles/files/pelafo.pdfIn PDF document text
    • https://afmiletisim.afmiletisimajansi.info/resimler/files/20635528724.pdfIn PDF document text
    • http://fzcce.com/aimgs/uload/files/63660415818.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/52085551910.pdfIn PDF document text
    • http://duythuc-bearing.vn/uploads/userfiles/file/51904933167.pdfIn PDF document text
    • http://upservice.expert/admin/ckfinder/userfiles/files/7210715046.pdfIn PDF document text
    • https://smartcrm.cloud/upload/files/76917006080.pdfIn PDF document text
    • http://ambulatorioveterinariosantanna.eu/userfiles/files/kojetoga.pdfIn PDF document text
    • http://pekingtogo.com/uploads/files/30965580681.pdfIn PDF document text
    • http://xn--pr3b03lcdvwu9dpynqkc.com/DATA/file/20210910135214.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16136bb0859689---mufobiwobe.pdfIn PDF document text
    • https://cfaegaianascente.pt/portal/userfiles/files/mijukunesozoperemesezod.pdfIn PDF document text
    • http://rszm88.com/upfolder/e/files/20210902011705.pdfIn PDF document text
    • https://ip-pharma.net/data/files/84005598978.pdfIn PDF document text
    • http://pi-consulting.ch/download/88497412189.pdfIn PDF document text
    • http://xn--82cac8d3ajrc0gd0bo4a7nf3qg.com/userfiles/files/39366468974.pdfIn PDF document text
    • https://www.hosotte.com/ckfinder/userfiles/files/pugabafexewipijo.pdfIn PDF document text
    • http://chaukitchen.com/uploads/files/81460997306.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_off0000bef0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEF0 16988 bytes
SHA-256: bc7a61dc7ccce76e6d05d0e08d4a27ea22b3cd7584fcc1b053064276d7efadb9
font_01_sfnt_off0000eaee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAEE 11232 bytes
SHA-256: 0b36ea7ff74cde9987d79aa2b647fbd3641bf8d3058bd6430a62c38a1cb5ade6
font_02_sfnt_off00010526.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10526 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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