Malicious PDF — malware analysis report

Static analysis result for SHA-256 643d7763651e54cd…

MALICIOUS

PDF

133.6 KB Created: 2021-07-08 08:03:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d91ce0dc2c123fc7b2ae352c14497d66 SHA-1: 1a9f80b754dc883e93afd1fd0f3739685fdc5ee3 SHA-256: 643d7763651e54cd8b009ea37d781d9cd9542d4c871512fc0f296051af878943
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ClamAV as a phishing trojan and the ML classifier returned a high probability of maliciousness. Heuristics indicate the document functions as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malware or phish for credentials. The presence of external URIs and the overall structure point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://chapelguild.com/images/usr/pemiwifemodupetev.pdf
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c28548b775---gusijetilutepopinotafavoz.pdf
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/e9641f701271fa5504ff26c9e19307ab/gitugewavozivemi.pdf
    • http://refpecsbelvaros.hu/kepek/files/19188659829.pdf
    • http://fsanaq.com/upload/file/210621021353892626mg2pzkt0gcv7.pdf
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4bc6f1ecf---jikemegogetorarozugoko.pdf
    • https://floridainvestment.cz/files/file/gejavaxopam.pdf
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160920a9b436cf---80770080618.pdf
    • https://spcinternational.in/ckfinder/userfiles/files/giwevob.pdf
    • http://eko-inwest.eu/upload/file/26363896035.pdf
    • https://iuoshili.com/upload/users/files/46041751654.pdf
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1608a461817d0d---18769108637.pdf
    • https://nestuby.com/userfiles/file/43212096083.pdf
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160807c5c09be2---35685532618.pdf
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb6f452b89---genukokunaf.pdf
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4bec154894---6546714165.pdf
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce70e39f71---21945130934.pdf
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/njf3a9midpfqdfiv885jdi6nd0/55714430218.pdf
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/9f02df9982b94a56f2f75d55bb151164/83830537043.pdf
    • https://chmelo.hu/sites/default/files/file/38396894038.pdf
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/qu7kj4qak14j8ilpbrk0fn0bsd/reduperinuxovabeduxir.pdf
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/8ulrvkq8vrtljgvhlq8v9dkm88/gexusoselelivoxemep.pdf
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/0f058bbd49692b33a1b19c49a128747c/jexapuduli.pdf
    • http://bobmeetin.com/media/galleries/files/fefijoxudaxagesosulumuwe.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=download+mod+for+mcpe
    • 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_off0001a951.bin
a2216ca76d7f246c265af1d38025f4663bee655c2e3f954e912fbf515a778465
pdf-font-stream PDF embedded font (sfnt) at offset 0x1A951 17972 bytes
font_01_sfnt_off0001d780.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1D780 16792 bytes
font_02_sfnt_off0001ef97.bin
10c1d967210207fe5c64d08797850c1468800929a8776a0297741b8768fd6422
pdf-font-stream PDF embedded font (sfnt) at offset 0x1EF97 10508 bytes