Malicious PDF — malware analysis report

Static analysis result for SHA-256 814e3e3d54dbc545…

MALICIOUS

PDF

123.8 KB Created: 2021-06-28 02:02:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ba436f1a3f25d0ac84b3d09370512431 SHA-1: 30c79146a89f6b99d9fbe334caa34d910f29d2c9 SHA-256: 814e3e3d54dbc545cb841c5e45018fa44eff9d821c1afbcb557b7f6a48abdb87
176 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to multiple compromised WordPress sites, likely intended to host malicious content or redirect users to phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, with the latter identifying it as a phishing trojan. No scripts were extracted, but the structure suggests a lure to external malicious resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c124ac075a8---sukojuxugutipipunujaz.pdf
    • http://zkojicin.cz/userfiles/file/93834582206.pdf
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6abb2268f6b47d4420399ee0ad632ff5/56624681966.pdf
    • http://allg-gyn.ch/userfiles/file/69038955971.pdf
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/429ae1c7664248d3578115fc59af4e21/87923374127.pdf
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f75651ef2---lidojawenusixitu.pdf
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c71877414---dawufaraxuni.pdf
    • http://astro2sphere.com/admin/images/file/64617188502.pdf
    • http://minerva-collection.net/files/files/86209129351.pdf
    • https://uniqrelation.com/userfiles/file/duxarakipaburiniga.pdf
    • http://asckhn.com/acskhn/userfiles/file/degepabujipuvikizi.pdf
    • http://builderall.info/userfiles/file/29676572265.pdf
    • http://jnnycc.org/userfiles/file/dopuleg.pdf
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a69e7d31010---17422663577.pdf
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608de15902947---zulajoka.pdf
    • http://ricoconsultingattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pavefajudovux.pdf
    • http://veterinariacasettamattei.it/userfiles/files/17367505643.pdf
    • http://blackhorsesc.pl/userfiles/file/rebududixiwukepojepavilo.pdf
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/m1qvmkij3n1uc9aa1ueff0s131/70201621322.pdf
    • https://xenang-mitsubishi.com/fckupload/file/sulajovabatok.pdf
    • https://akita-inu.lv/www/files/files/41611815991.pdf
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/14524968136.pdf
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/7c5e2cf0746623a42f3c15438ef26e30/genonubu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=map+of+downtown+fort+lauderdale
    • 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_off00017d18.bin
f76cdabe383779c08ff34aa47d741e7c125963c26d61b52db6764b7b6f0682df
pdf-font-stream PDF embedded font (sfnt) at offset 0x17D18 19716 bytes
font_01_sfnt_off0001b07b.bin
d05eedb44e175b94879656a689ab1933b098ddab0b3424ad11239e552753c6e8
pdf-font-stream PDF embedded font (sfnt) at offset 0x1B07B 10408 bytes
font_02_sfnt_off0001c83f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1C83F 16792 bytes