Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ab52f741d7f6472…

MALICIOUS

PDF

86.7 KB Created: 2021-06-28 11:05:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4f3ce6b687fb8ef71658e8cab99182e9 SHA-1: 3bdea10be589e2ec752215720f5576ef406951b6 SHA-256: 4ab52f741d7f647220b9a28cb163138008697f8edd100eca833cc27f592df0be
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, hosting numerous URLs on compromised WordPress installations. These links likely serve as lures to phishing sites or further malware delivery stages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/32b33820dadda7a28c4012255a1d3965/xigavojilaxugig.pdf
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/a299499a1a0a9faa4e03b1fa5b5f3576/69266103450.pdf
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bad425294ec---12813672624.pdf
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a28a2fbf62c---29549699150.pdf
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/4d6287006346479746b00ce2c4960b16/wabipebijidofovosen.pdf
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/734c87c124117406949a8207db59be42/64193519728.pdf
    • http://mevlanaasm.com/resimler/files/bajefukitajedotasefet.pdf
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/dbf4c45e99909cf5e7edf2fb663caa5e/kiwapikukeket.pdf
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160712deba53ef---73833577799.pdf
    • http://berkeleyhigh64.com/clients/9/99/99a482d4bd0dc5522cc24ea7f8204a07/File/laruzigisimadofag.pdf
    • http://asiavent.com/UserFiles/file///18609982457.pdf
    • http://laclonghotel.vn/upload/files/2426911262.pdf
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/1a2e30ea2db6e06e42161604e0a060e4/75037999092.pdf
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/fbbaac9b306c205dec7bba4cbe7bb10c/tobuxomerovideta.pdf
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/te5ms88q75814npk9dlq2a48vt/venawadidoxexu.pdf
    • http://historia-bfured.hu/userfiles/file/85122998393.pdf
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16075aefe32ff2---niwakinalil.pdf
    • http://www.jobsincrete.gr/images/_user_na/file/dumodewotuxalikemubogozul.pdf
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dffc1636b9---rigovojosezopikunogis.pdf
    • https://alamansyria.com/userfiles/file/nosugazosasaletitamono.pdf
    • http://broadviewlibrary.org/uploaded_bvlib/file/19032318506.pdf
    • http://artin-intranet.com/ckupload/files/daminejaterukubuko.pdf
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7350153d68---mawakixekitubotavupow.pdf
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/07a300bae6820fb3812ea3aa12d083f9/jekunejasenavezorisut.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=how+do+you+say+flip+flop+in+spanish
    • 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_off0000ed06.bin
dca3ac07a62f41741bf42aa679f76e45a5c0b4a238d10af4b705b6a2b77410ce
pdf-font-stream PDF embedded font (sfnt) at offset 0xED06 18404 bytes
font_01_sfnt_off00011d62.bin
b93c98ca3182a729ea8686c383a04ac6d2f2d129520e656065b48517e4f90170
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D62 10556 bytes
font_02_sfnt_off0001355b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1355B 16792 bytes