Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b1cba54c5c98950…

MALICIOUS

PDF

90.0 KB Created: 2021-08-15 03:25:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3512c4e6ca3f0da9b406f5e904d63a76 SHA-1: a6eeae46555899132f2fd4b27f61fa3cf1123365 SHA-256: 9b1cba54c5c98950402a02bcd0b325d01cd59aa2ed1b865f253247d6112653fb
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites, which likely serve as a link farm to distribute further malicious content or phish for credentials. The embedded URLs suggest an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160829ad70e85a---31433180950.pdf In PDF document text
    • https://wegofa.com/userfiles/file/14238417233.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/r7ap0afjhboeet8kbm7fvc4351/vefusafaxolizeme.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1609b39f92d029---10468059084.pdfIn PDF document text
    • http://galantemontagnana.it/ckfinder/userfiles/files/16023020112.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/0623749c2d9a69c7aac83cae376cdac2/dikumusisorefilajivojij.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/20504571622.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/obohtav6gugl48epq0tljgffi2/78847059755.pdfIn PDF document text
    • https://cjsc.se/ckfinder/userfiles/files/gawusirufeguvipotonaw.pdfIn PDF document text
    • https://parlagame.com/calisma2/files/uploads/2379917013.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607c519a035f6---56622039310.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/fvc5qk512qnhov2bnvdkg1igcl/sexixiduguwijurex.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/20944941269.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/acf7b46f87c82530fba98bfba3653f6d/ledimotigiz.pdfIn PDF document text
    • http://pkynfe.net/userfiles/file/boxodepalijoza.pdfIn PDF document text
    • http://bkht.vn/userfiles/file/64716795170.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/fba294d08f43f4af73cc36411e71d7d7/64680003162.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609c42c3c8623---gadudofumalebigetek.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b456ab3a3---palowifemosisisevavunage.pdfIn PDF document text
    • https://roofmed.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b226f927bf5---loraf.pdfIn PDF document text
    • https://pabrikangka.com/contents//files/62698948360.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/55756066344.pdfIn PDF document text
    • http://bancasemecanino.com/userfiles/files/65006137313.pdfIn PDF document text
    • http://basaritarim.net/admin/editor_resim/file/kowedisonuve.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=nicel+bir+ara%C5%9Ft%C4%B1rma+%C3%B6rne%C4%9FiPDF 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_off0000fb45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB45 17884 bytes
SHA-256: c6c5ec16d4318920e6187f1142cc83feb774c7dcaa51d5781bf324a9f476477c
font_01_sfnt_off000126de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126DE 10956 bytes
SHA-256: aa61ac7204fc8944b61cc58fac428ac7b91f70a7e70cda58feec833439056008
font_02_sfnt_off0001401d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1401D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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