Malicious PDF — malware analysis report

Static analysis result for SHA-256 abcc146b4c447eeb…

MALICIOUS

PDF

74.8 KB Created: 2021-09-04 04:15:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: bbd229b3e51816bbab08771215af5a33 SHA-1: 649bde0e0428b65efd76d3f88825d39678fb30e1 SHA-256: abcc146b4c447eebc94e12ba4d62b119d74d577e8241a3346c12d9276f6f26e3
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to numerous external URLs, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic firings clearly point to a malicious link aggregation strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://suphammamnon.org/uploads/files/9053851325.pdf In PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/40167470236.pdfIn PDF document text
    • http://bouwbedrijfansing.nl/userfiles/file/gepogasugegolawutikupida.pdfIn PDF document text
    • http://fedoro.ru/upload/file/71194667191.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/505f42f7ac064d84078c72303b830ff2/23863047920.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093fa6544f9f---siregoxeraxiriwizaxut.pdfIn PDF document text
    • http://hamyarsanatco.com/ckfinder/userfiles/files/zavopowilebarapikimil.pdfIn PDF document text
    • http://status-go.net/gfx/userfiles/files/koxalegadez.pdfIn PDF document text
    • http://tochalco.com/uploads/files/loxinorutelib.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/d4c0c4e9a973ad4bf8e32606e0424bcf/sudowepagovuzekal.pdfIn PDF document text
    • https://voyageaventurenepal.com/upload/files/51986618375.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608559749fc5f---vorajitasovezapixobamib.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/161237f5502eb6---zafodopuxotufexuzazukobat.pdfIn PDF document text
    • http://ibb-online.ru/f/file/pojunerunela.pdfIn PDF document text
    • https://banktapeunadana.com/tapeunadana/bank2/admin/userfiles/file/rukolagad.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160dbd8e36c0bb---guxaranebefuk.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/f129e27abd079c18ba41b53ad63917ee/93993455150.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/64473732116.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/a1f6855a14304e7a0f1ad76f6ac7174c/97330535868.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a9dd407fb02---61937028225.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de4ef3b2121---varokubigeg.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608299ab2d4af---5939693522.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/xipujajazaxowunasup.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/kamegu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=lisan+ul+quran+guide+7+pdfPDF 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_off0000ba8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA8F 19724 bytes
SHA-256: a739a2e81b215a855c163cc67eb20477a24323cfc62de7174d3090dbbdffacee
font_01_sfnt_off0000edb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB1 10708 bytes
SHA-256: c21904fbe0535727fb4c35a4df8b72eb822152e5ca207b1f4c04c39156a003d1
font_02_sfnt_off000105d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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