Malicious PDF — malware analysis report

Static analysis result for SHA-256 156cbd41fc74ec98…

MALICIOUS

PDF

83.5 KB Created: 2021-09-01 00:38:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 149b1a62f247c6c6e5cc8df3a8790883 SHA-1: e47b80e917cea8f6853dfd186e2290619fabfd91 SHA-256: 156cbd41fc74ec9850a80b1e4d3b2cb9ad1643743cf33e936026cc555bff9e7b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which point to compromised CMS upload directories or are hosted on disposable domains, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, but the structure suggests a link farm designed to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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 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 http://darec.sk/files/files/palosemirevisagi.pdf In PDF document text
    • https://iringmalaysia.com/ckfinder/userfiles/files/kagakidufexi.pdfIn PDF document text
    • https://samowar.ch/upload/file/zazamuzosomuxobu.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4bfe2b2c2---dojumon.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/ba7fdd414ac000733e1f872005731859/93584976402.pdfIn PDF document text
    • http://kirakuramen.com/uploads/files/3660809856.pdfIn PDF document text
    • http://sdhmladavozice.cz/userfiles/file/34574305177.pdfIn PDF document text
    • http://btc-ltd.com/upload/file/dasenovajigizofivez.pdfIn PDF document text
    • https://opescom-store.com/uploads/FCK_files/file/49204257308.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a814c75c443---rimakijisewutokopijime.pdfIn PDF document text
    • http://pillshop.ru/uimg/files/97887621222.pdfIn PDF document text
    • http://cristal-in.fr/userfiles/file/28132777388.pdfIn PDF document text
    • http://lecostationery.com/files/file/nosikak.pdfIn PDF document text
    • http://kleni.cz/userfiles/file/89222662611.pdfIn PDF document text
    • http://miroslaws.com/ckfinder/userfiles/files/59341479874.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c84665fe09---poxexuxosow.pdfIn PDF document text
    • http://anandtouristcorporation.com/uploads/43688747415.pdfIn PDF document text
    • http://world-green-hope.com/uploads/files/xonijuzugomadejek.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7887ab3290f198bcb0cc4c56a7587af5/parafidobiz.pdfIn PDF document text
    • http://cokhilegia.com/upload/files/94923745849.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bcb57877ef---18252006104.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/072906d46b9619e6f5041178c40d3272/3836832781.pdfIn PDF document text
    • http://xnucleus.com/members//member_images/files/70092712778.pdfIn PDF document text
    • http://penzionnakrizankach.cz/ckfinder/userfiles/files/favafudawetubimegikix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=at+least+meaning+probabilityPDF 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_off0000dc40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC40 10828 bytes
SHA-256: 012e498c7ac9ae13a064fd05cdb31d0b281d19e115fdaa30ca6f55e3f599c8d0
font_01_sfnt_off0000f4f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F7 19148 bytes
SHA-256: 730ed1b7f7af0ed92952f41d32cfc04aad481f72710cf33e6ee79a0ff190c440
font_02_sfnt_off000127d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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