Malicious PDF — malware analysis report

Static analysis result for SHA-256 87efc211ac0217b5…

MALICIOUS

PDF

147.5 KB Created: 2021-06-10 00:16:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 933131897163e20e49df1821569a95dd SHA-1: 2c38d224c5fda5fe7d0aa2cf934db68a6db35ec9 SHA-256: 87efc211ac0217b58294536de1f4783c54020733ebfd65ce90af6249f05c12da
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. It contains a link farm pointing to multiple compromised WordPress sites, likely serving as a lure for users to download further malicious content or visit phishing pages. No scripts were extracted, but the presence of numerous external links suggests a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://nomylo.ru/uplcv?utm_term=prince+florian+disney+age PDF link annotation
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160822fc0edb4b---pubuvasumaxorufegonebef.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097f25185d85---xobikepej.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/fuzubikev.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b0608fb1ab5---26651785783.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160ad7e895b49d---furozizosupegafu.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/3861373658.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/chfujjasjherkdv3qkonqq1nj7/36777347403.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f4b3760915---wisog.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b2597df1648---kitokogal.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/d4c4376ff86d8ebe247171937052a535/jabirokafidetediromilewif.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/16095a9cb5329c---64910174929.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/gd2gbbds0pqsf16meh87m0jbt6/fimopewabonudakutiwi.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/85239223708.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe6787bce7---94940686865.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608382317babf---sawabu.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/315773b20399327703dd316711b5443c/paruvadadafasebexitem.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001a052.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A052 12324 bytes
SHA-256: 14a6202230a4605cce7c1d66038a75ffc71c2fd3764566e3a89d3b1e83e2e0f6
font_01_sfnt_off0001c8e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C8E2 5292 bytes
SHA-256: 910633619efa6574760d174817a4d6d3234ba89f0a85ba23d7c09d0523b4fd57
font_02_sfnt_off0001daf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DAF4 7856 bytes
SHA-256: 8ff45a165b1d27f79fc4c39c8241b6266270237edd8f2e5d548c6006177dc127
font_03_sfnt_off0001f0bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F0BD 18536 bytes
SHA-256: fa8f34672682416484f99b907a86e419a4a853ec00e67f5afb11ceb037c3d498
font_04_sfnt_off000227b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x227B1 16916 bytes
SHA-256: 52993e5127f0221118b22e942c4809b6ef71761333344fa7f3ad6b660a426630

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