Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f562fa9e0ea2aed…

MALICIOUS

PDF

81.6 KB Created: 2021-09-03 22:18:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 570fd452c26d8c9173310668b59ff4b3 SHA-1: 4cdb10eae9c1887077363aeecdffbec4bf866139 SHA-256: 1f562fa9e0ea2aed1eb4acec59fd108637b9b67edb18094ae044501800ee9d4c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous URLs pointing to various websites, some of which are hosted on compromised CMS upload directories. This technique is commonly used to distribute phishing content or redirect users to sites hosting malware. No scripts were extracted, but the PDF structure and URL patterns suggest a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/36182391323.pdf
    • http://jar-ted.pl/file/tifiteliloxinarejaliz.pdf
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/ef212b1320407a503f13c9073b8f4351/vokiduxivu.pdf
    • http://edu-soft.ru/site/htmlimages/file/66085246643.pdf
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a506cbc91d---36241231895.pdf
    • http://bioterapiazabiegi.pl/obrazy/file/73714950652.pdf
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160d8c6619ed24---58594002534.pdf
    • http://stonebreaker.at/pazemanuxesegogope.pdf
    • http://discus-rus.ru/upl/file/95447846145.pdf
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609afc9635cbc---49676620550.pdf
    • http://clair-environnement.eu/catalogue_dynamique/file/vekafetipafu.pdf
    • http://mobilesamara.com/img/files/file/jumegavowivipazofave.pdf
    • http://geyikkimya.com/userfiles/upload/file/latuxizikelofunis.pdf
    • http://kientrucsangtrong.com/plus/files/12938705651.pdf
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/84d98515418edbffd70f9f995cc80bef/legegasexirabawaw.pdf
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5491837bdc---fejinumoximenitidupa.pdf
    • https://people11people.gr/uploads/File/foxunotemepefimekekun.pdf
    • http://chromatographvials.com/d/files/jojarolopamozurow.pdf
    • http://thewhitmerlawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zefababofifibozebe.pdf
    • http://eotp.info/sites/default/files/fck/file/mupeduxeroz.pdf
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6b87126ee760039a9f08e9f37b5be850/zazogadelofojujijap.pdf
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6dcbe7e93---52055844876.pdf
    • http://tekizolasyon.com/ckfinder/userfiles/files/45299916773.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=civilization+board+game+rules+pdf
    • 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_off0000d8bf.bin
4f3e94c743c714d711615b734658c72414d53dded2ae6eacb1d4d16e33b1562c
pdf-font-stream PDF embedded font (sfnt) at offset 0xD8BF 11236 bytes
font_01_sfnt_off0000f2bf.bin
fbedc5ed553ecf75b2928218c84c867376bcc2382e81f2d8534ed8f5dc81faa8
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2BF 17928 bytes
font_02_sfnt_off000120f1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x120F1 16792 bytes