Malicious PDF — malware analysis report

Static analysis result for SHA-256 10496152f7ed10dd…

MALICIOUS

PDF

91.9 KB Created: 2021-09-06 16:55:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 86d89783a93c37ffb1b1a937c4567a37 SHA-1: ebebaeee11b071058b16e1205d6bd91749961d05 SHA-256: 10496152f7ed10ddb89679f53bca7491310752dc1f4c8b6db89d654c4392c877
136 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to compromised WordPress sites and disposable hosting, indicating a link farm designed to obscure the final malicious destination. The ML classifier strongly flagged this PDF as malicious, and the presence of multiple PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports a malicious intent. The primary goal appears to be redirecting users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://dm288.rs/slicice/file/68501900607.pdf In PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/jfepm4ru6ljg7tf99uu0jvd1i4/sakoxe.pdfIn PDF document text
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/c635dc615e9c39fff7535fc71cc28f68/50035806234.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160762427cea2e---renibi.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/ae9483c23c2127c63aad804b650c8a1d/titanefiberixowojogolal.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/ckfinder/userfiles/files/56548687355.pdfIn PDF document text
    • http://cosyromania.com/media/file/19512111543.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/6655197a22c5b4fa298543c9e8384df7/dokidotatokapareli.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/4326414613.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/gunogiz.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/bv0vj0rbj3fksfsms5tnkolo97/ladifoniri.pdfIn PDF document text
    • https://www.tanyadantus.com/wp-content/plugins/super-forms/uploads/php/files/035ae0605f97770a192a5220bf5620ad/23259567579.pdfIn PDF document text
    • https://rarahil.org.np/ckfinder/userfiles/files/fifamotofipibepe.pdfIn PDF document text
    • https://nhahangthanghuong.com/uploads/files/44851681727.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/42691601581.pdfIn PDF document text
    • https://serwisnawigacji.pl/userfiles/file/90129039211.pdfIn PDF document text
    • http://thrifthelp.com/flash/thrifthelp.com/file/11145778328.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/c5ue04c4v2581ohdsvqev02lfc/wiredemifomidufin.pdfIn PDF document text
    • https://robertbah.si/files/file/13366204777.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/bkoup6dsdc2jd410v356nd1v96/69258238316.pdfIn PDF document text
    • http://grupophi.es/uploads/files/94346884351.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160e2e26ed93d1---791758156.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611bd643f3d1a---vakamibisoxubud.pdfIn PDF document text
    • http://qualityspices.in/ckuploads/files/32807252258.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=music+theory+for+beginners+worksheetsPDF 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_off00010048.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10048 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001185f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1185F 10932 bytes
SHA-256: 73365908f2feae4e44bbce266b3b4bdb38b7a32bda6779d39c370f986b688a9d
font_02_sfnt_off000131c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131C9 18248 bytes
SHA-256: 5db3474562c4e571dcfe5d08c9d42ca77170cf7649f22708d4960236d7a83ac2

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