Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c2b4dcd1ddbd261…

MALICIOUS

PDF

74.9 KB Created: 2021-09-13 15:47:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d8c9ddb89454dc4cad3476120a286fd4 SHA-1: 8d562777bbf6d2b55aef2a85481b4ed87810d87c SHA-256: 7c2b4dcd1ddbd261edcdb54b2e84d5dc518332877f3c609236aec3a0a754e9bb
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains multiple links to external resources, many of which are hosted on compromised WordPress sites or disposable domains, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to trick users into downloading a secondary payload. No scripts were extracted, but the PDF structure itself is used to host and link to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • 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://www.studioline.ie/ckfinder/userfiles/files/50005533404.pdf In PDF document text
    • https://infrapanel-alegjobbfutes.hu/userfiles/file/16992920567.pdfIn PDF document text
    • http://kamnitikamini.si/upload/files/wepagesazavanosaserus.pdfIn PDF document text
    • http://lucidarepavimentimarmogenovaealessandria.it/userfiles/files/64176326506.pdfIn PDF document text
    • http://prosquash.by/data/favikumujut.pdfIn PDF document text
    • http://rm-centr.ru/uploads/file/vonavudaveromumujadofaf.pdfIn PDF document text
    • https://cribpointonline.org/cribpointonline/userimages/file/88680402723.pdfIn PDF document text
    • https://gizaviation.com/uploads/files/xapejafaz.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613266b334f54---guzagumokevizafunijakupes.pdfIn PDF document text
    • https://anukulagrotech.com/ci/userfiles/files/kajiwiputofelameko.pdfIn PDF document text
    • http://harc-ias.vn/Images_upload/files/dumibezogidibimonuke.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/suzowelegeda.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135ab7136dcb---wabexajigedi.pdfIn PDF document text
    • http://groupementpecheduloir.com/ckfinder/userfiles/files/datikodilesawa.pdfIn PDF document text
    • http://hankyunget.net/userData/board/file/58522999842.pdfIn PDF document text
    • http://apvn.info/userfiles/file/70447672490.pdfIn PDF document text
    • https://bibliotheque.ville.deux-montagnes.qc.ca/ckfinder/userfiles/files/94203080156.pdfIn PDF document text
    • https://proetcontra.hu/userfiles/file/zerelifo.pdfIn PDF document text
    • http://biancoacolori.it/userfiles/files/22896706397.pdfIn PDF document text
    • http://luligang.com/ckfinder/userfiles/files/8033474748.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/nenekipuwusokenopetun.pdfIn PDF document text
    • https://xn--80aesyq.xn--p1ai/files/file/dibokojewarexiwimesizoro.pdfIn PDF document text
    • https://fotofidelity.cz/userfiles/file/44836815608.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5c6f6cb39---judon.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16134d82b6c5bc---getobumolamatiku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=adb+hard+reset+commandPDF 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_off0000bade.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBADE 10616 bytes
SHA-256: d53f4dd255da50b1fb508eda5747bec5d706b2d0de95e9d7c920c7772a16f3b3
font_01_sfnt_off0000d2fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2FC 19468 bytes
SHA-256: 4813dc9558b91e4b6dc8b668b4f7cd2dbffdc9fbeddf5c1d722718ee21eb3b38
font_02_sfnt_off0001061f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1061F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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