Malicious PDF — malware analysis report

Static analysis result for SHA-256 910149c752963120…

MALICIOUS

PDF

83.7 KB Created: 2021-07-19 14:43:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8bea9a25f2eb2b5022e868580fa68dda SHA-1: dcb0cd2e0b62c98d7b3df2a9490dfd5588eed685 SHA-256: 910149c7529631209b29ea371ca14d60771ebdf93c282af3927fd284c2d15c75
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories and disposable hosting, indicative of a link farm designed to manipulate search engine results or host malicious content. ClamAV detected this as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The document body was unreadable, but the heuristic firings strongly suggest a phishing or SEO spam attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://palami.by/images/file/vuvobi.pdf
    • http://albatrossmrn.com/konadnew/userfiles/file/fivitumokefususod.pdf
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/9cjmrvi46ft06ik0q9j8o26554/fobigazidinomipe.pdf
    • http://skisun.it/userfiles/files/21908980366.pdf
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/4sst3gaso70seo6vnd7nku8bk4/bujomenatirufatut.pdf
    • http://r2doodles.com/clients/4/4a/4a4ed909dcef54c1e3ec6a0ce1d29f2d/File/8692999411.pdf
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/4ef22490e52897cc4944e84b4ed75a83/16799217557.pdf
    • http://billcolletterealtor.com/clients/e/ef/efe7172bdc9c6addedf700543cb5cb37/File/dobelamabowuruf.pdf
    • https://dienlanhbachkhoa.info/upload/files/jibufigesidaj.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be4ccca5769---88484778878.pdf
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8e0fd66d63---vifuloruveveg.pdf
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b6af3070aa---xefunikafijixusonefuk.pdf
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/5e17bf2e14a37825139f2bd16ebb4bbd/78558975406.pdf
    • http://studiobaliva.eu/userfiles/files/24071954630.pdf
    • http://ruishikaishi.com/upload/content/files/2021/06/20210625090733.pdf
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16099a49d9ea1f---50562314229.pdf
    • https://accuratesearch.com/userfiles/file/35393578190.pdf
    • http://industrialdevices.in/uploads/liromagilajexet.pdf
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/b58f92f948afb69981ebd1a63d4081d8/57884746352.pdf
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/34721135b29c3f0aa6757f3a9f5b4dc1/13676942830.pdf
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/0pb433mghg0vfkrpnq4v0qng83/zererel.pdf
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/7c6d000c99a25ac323ae2468353a3d3a/25304940869.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=how+to+write+a+case+summary+example
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5d5.bin
a28d54fde3590d8a5d1b77fde9a6e0c5d26b071b384ea578a7f6cfb81671e4e2
pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D5 10824 bytes
font_01_sfnt_off0000feec.bin
659499805f9744d518216214d7775c117bc2085059bdd4317777702b11dad1c4
pdf-font-stream PDF embedded font (sfnt) at offset 0xFEEC 16588 bytes
font_02_sfnt_off000129a7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x129A7 16792 bytes