Malicious PDF — malware analysis report

Static analysis result for SHA-256 388d9c2060bc39fe…

MALICIOUS

PDF

101.3 KB Created: 2021-06-29 03:57:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 209b2c2261ae8c2f1bc2d4e9b06e61e6 SHA-1: f9626072cc1e98ca9bee250fca2862e1b3e968a8 SHA-256: 388d9c2060bc39fee038f6d3de00783005e6dbee2fba051516b484696ce2a432
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many pointing to compromised CMS upload directories, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of numerous external URIs and compromised CMS links points towards a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://crewmak.ru/uplcv?utm_term=meaning+of+latinx
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16083998018851---jugoguvejivixikisexi.pdf
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d7a8738b9b---fuwurobe.pdf
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/48628685c8c077f0051d1ff58bac5028/pivarozisazuvo.pdf
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/bj1tqivn4lllplo72ksrfo83vq/ravanikunikoniz.pdf
    • http://mintaialuminum.com/d/files/jedipotowaguf.pdf
    • http://skogsformedling.se/bilder_umeny/File/wofularejifulajufogulu.pdf
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607820b8e9d10---kepokuxuname.pdf
    • http://biosurfest.com/userfiles/files/lusawasiriwatulasizavuti.pdf
    • http://braciszewska-klimek.pl/fck_files/file/sizaxebowarebofazunesa.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/i8en8uqtlqq3jshm167uakb936/48541843553.pdf
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/d09e2ec24c75eb4368a0482faa6d3fd4/tebivusufumibosa.pdf
    • https://ph2020.org/FCKeditor/file/pupululuzulotevut.pdf
    • http://toyteepee.com/uploadfiles/file/210513123701334970onaeta.pdf
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/475b4397143679c0e79352de23cd31a1/wijesuserojevine.pdf
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/461c58a39937d7f5983ee0e77f1af602/53062490333.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/baalnkrbf5m6i7sr7j718g05hs/61479652075.pdf
    • https://stallion-international.com/userfiles/file/foxujifowevukumuvuvuwoxuz.pdf
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16080592540c6c---lavozikamaluvemirepagow.pdf
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/4c1194e73b641faa0076de31217588ea/40816743119.pdf
    • https://lederstuehle-shop.de/ckfinder/userfiles/files/sufemobokeda.pdf
    • https://proxus.nl/file/80818341652.pdf
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/1113e329862a03edddaaae9abae967da/runonasomi.pdf
    • http://myafmc.com/clients/a/a5/a51d49d85de18111a3d718c63a5e5081/File/kemevunojuvobajojuko.pdf
    • http://fdscience.com/UPFILE/userfiles/files/sabixopazekafuwevadid.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_off0001221d.bin
152ad81a3518ad41b60e442c0af25d38a6f7b98f97ed281952c65e48511499e6
pdf-font-stream PDF embedded font (sfnt) at offset 0x1221D 10216 bytes
font_01_sfnt_off0001392a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1392A 16792 bytes
font_02_sfnt_off0001513c.bin
10e9325b872ced0bcffea95c98b45e99eaa6a2de2053857c36cc8b32933f4cf0
pdf-font-stream PDF embedded font (sfnt) at offset 0x1513C 20284 bytes