Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4aecf62ab938867…

MALICIOUS

PDF

204.5 KB Created: 2021-07-07 21:59:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: b492eedcf9bfc3705286efce0627e224 SHA-1: 37662770c5a777348bc4d90e281cce93b8663d0b SHA-256: a4aecf62ab938867a824ff63d9cc9fa858f60d59b1c8c92cbffea66e88eb0da9
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous links pointing to compromised CMS upload storage, acting as a link farm and SEO redirector, likely to lure victims to a phishing site. The presence of embedded URLs and the nature of the heuristics suggest an attempt to trick users into downloading further malicious content or visiting a malicious website.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9899

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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.
  • 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://stevis.cz/files/file/588051464.pdf In PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/ca669623e704ec9f6a04a93ab11442a8/pemubixujajose.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/2e4b45c66f1abc1e425ca503cb63aa63/51937197683.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa7a65f1dd7---zoxegekafenivudereji.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/72vg2c4qdocdk7rrpqg403o4tc/60218243143.pdfIn PDF document text
    • http://hevolta.com/upload/file/32343387372.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d68a31bc9b3---sisezaduguvezitusogap.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-05-27/images/files/jabekijek.pdfIn PDF document text
    • http://womenscouncildallasarboretum.org/clients/85748/File/3912369996.pdfIn PDF document text
    • http://activesolutionelectric.com/images/file/revabupasuzepowovadugo.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/7199ca481dff5601541c880938500f30/pigiza.pdfIn PDF document text
    • http://wib24-admin.de/uploads/file/84579355674.pdfIn PDF document text
    • http://koreanhotpot.com/uploads/files/12064931015.pdfIn PDF document text
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607054a438fae---48565175489.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c5cb79d2012---xewubixozidasosena.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/99bf39ca614a94feb88c49f5a1175626/sotanus.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ada8fbb17b---86856725205.pdfIn PDF document text
    • https://www.passion-rnd.com/upfile/files/2021/06/29/xogadunavokoroxiju.pdfIn PDF document text
    • http://ranaghatpchsschool.org/userfiles/file/54907844876.pdfIn PDF document text
    • https://sinarwaja.com/account/files/38467850034.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/37ls1r58mekhbpv50tc86ou0ea/nexalu.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/8062071242.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=the+salvation+unmasked+pdfPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0002c4e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2C4E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0002dcfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2DCFE 10884 bytes
SHA-256: 0d05f8d7f26f7498d34756e672ce9dbd2220af084dc74af73d2419a9cced0ef8
font_02_sfnt_off0002f602.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F602 17376 bytes
SHA-256: 52e2ad8f21e7daaf6cc067efdbfeee0cb200060cffa9b05d35ef11b8d1c68d00

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