Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc9a8edc78acfa35…

MALICIOUS

PDF

73.8 KB Created: 2021-09-13 15:16:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9774b4ad5b82f9254ec362fa1a81ed0d SHA-1: b13fbbdafc12b75be6d25b5f142629db2de98e66 SHA-256: fc9a8edc78acfa3526c12750a5558cdab330b9fe7477e31d9da6f515430b40a4
184 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a large number of external links, many of which point to compromised websites or raw IP addresses. These links are likely intended to redirect the user to malicious sites for phishing or to download further malware. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/161372059f2c6d---xobuwepobojojomibod.pdf In PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/u2c18i7mjveptp9m0qroqcif19/mifelupiponewepusesata.pdfIn PDF document text
    • http://soloparamideco.com/js/new/fckeditor/userfiles/file/nuwope.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/6g104cqgt7lqo846jb8c1pq296/99283695174.pdfIn PDF document text
    • http://enjoyisagenix.com/ckfinder/userfiles/files/sodokamaweketiwixuzev.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd396cb0fc---60017759262.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/78158581591.pdfIn PDF document text
    • http://vetsnab32.ru/userfiles/file/21098548602.pdfIn PDF document text
    • http://bobmeetin.com/media/galleries/files/natodewojuwipapufaf.pdfIn PDF document text
    • http://dentalcenterstudio.it/userfiles/files/75680772412.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613f3ad4d10b6---tuwisunamewitigerunaxoxim.pdfIn PDF document text
    • https://gres-k.cat/userfiles/file/kufizozumubofex.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef58d3960b---31837572335.pdfPDF link annotation
    • https://www.sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/94571981899.pdfIn PDF document text
    • http://www.stemcellhairclinic.com/files/files/dalirome.pdfIn PDF document text
    • https://www.willmarshelter.com/ckfinder/userfiles/files/23202276161.pdfIn PDF document text
    • http://hoadon-dientu.net/images/files/92643528225.pdfIn PDF document text
    • http://damutech.kz/upload/2021/09files/210912020325951420psv0l.pdfIn PDF document text
    • https://northwestconvention.cz/data/files/46724145184.pdfIn PDF document text
    • http://fairway.cc/images/blog/file/gexedebubarabifepirataje.pdfIn PDF document text
    • http://szigmetal.hu/editor_up/52912993824.pdfIn PDF document text
    • http://sgadsahodayatarntaran.org/sahodyatarntarannew/userfiles/file/64552316891.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=running+android+apps+on+iosPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000be6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d682.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD682 10436 bytes
SHA-256: 4dcc46b232069353c777a3fa71b2c75615eea4bd32f26f31c2b46a8d70f792d6
font_02_sfnt_off0000ee00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE00 16640 bytes
SHA-256: 8ab8f8911d8af85feaad4a3d6057824a1c139fd990d189bee0fc550d53ec87ba

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