Malicious PDF — malware analysis report

Static analysis result for SHA-256 90015ca2e12e0f56…

MALICIOUS

PDF

79.2 KB Created: 2021-09-19 03:44:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 1ee6120d367c6d090f9d9e76cbf5db2f SHA-1: 2770ea81f380fa717bccb9a14311513b0c1ae8bf SHA-256: 90015ca2e12e0f56a0c30711ce26e8192be036446e3b9534af4c7b72ec908ad8
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and ML classifiers, indicating a high likelihood of malicious intent. Numerous heuristics fired, pointing to the presence of external links, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and appears to be non-readable text, further supporting a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://laborke.ru/uplcv?utm_term=mcpe+1.1+apk PDF link annotation
    • http://saeronbio.com/userData/board/file/sepaneru.pdfIn PDF document text
    • http://generoussecurity.com/uploads/reseloname.pdfIn PDF document text
    • http://hotelrefah4ter.ir/basefile/hotelrefah4terir/files/7036409012.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/161397d9ea77be---gawuk.pdfIn PDF document text
    • http://tnmetalworks.com/images/files/zupapupilopivipagelilawu.pdfIn PDF document text
    • http://ithalattagarantibelgesi.com/resimlerfiles/tisag.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/finawanaludute.pdfIn PDF document text
    • http://hizirferforje.com/admin/fckeditor/editor/images/file/pamivekodejobazofiwakifi.pdfIn PDF document text
    • http://manpukuorder.com/uploads/files/lerojusatu.pdfIn PDF document text
    • http://www.enjoyvaltellina.it/admin/ckfinder/userfiles/files/vepawutajekarazafed.pdfIn PDF document text
    • http://chuabenhxuongkhop24h.com/images/files/99015646670.pdfIn PDF document text
    • https://nedimgame.net/calisma2/files/uploads/doperovogatedowekivubelif.pdfIn PDF document text
    • https://needletherapy.eu/upload/file/gewojelebizizaj.pdfIn PDF document text
    • http://chinajessie.com/seadata/data/uploads/img/file/163177745410.pdfIn PDF document text
    • http://verkaufs-akademie.com/userfiles/file/pivavobulemisop.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/3211e81fd7e82f1323437f4c79e95605/fawikivareboranumuvul.pdfIn PDF document text
    • https://www.bosingels.nl/ckfinder/userfiles/files/zeweporedige.pdfIn PDF document text
    • https://debcopharma.com/userfiles/file/potadojasutale.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f9cee837cd---sakofokasunura.pdfIn PDF document text
    • http://fizjoactiv.eu/Upload/file/miroxemutejewajutib.pdfIn PDF document text
    • http://optometrystaprzemysl.pl/userfiles/file/fotunowemo.pdfIn PDF document text
    • http://nrgmedia.hu/files/file/malenamidatowen.pdfIn PDF document text
    • http://www.ddu-hk.cz/ckfinder/userfiles/files/75808936049.pdfIn PDF document text
    • http://pro-elec.ru/ckfinder/userfiles/files/30318641.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/klq6sisu6nj9dpt02bnu7o7db1/26980010349.pdfIn PDF document text
    • https://easyown.ddproperty.com/datas/files/63202890741.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_off0000d32c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD32C 17924 bytes
SHA-256: 3203379333f4660d88a6c70c47ba559fc7d3782e546f97461eb2781c8283d1a7
font_01_sfnt_off00010120.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10120 9844 bytes
SHA-256: 858d9921f4e98a50b709ececca2e4579f5da55e09716d2eee34fd41e42920841
font_02_sfnt_off000116fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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