Malicious PDF — malware analysis report

Static analysis result for SHA-256 492e22f04077b2b1…

MALICIOUS

PDF

72.0 KB Created: 2021-09-02 01:43:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d6cd8766d3ec121d25149d26a32a6dd7 SHA-1: d8c4fd3cf49443080bbea9dcb0bd7ae4007f1eda SHA-256: 492e22f04077b2b1052134b10199f2c23d2dc6686969d287ed795033f59049ed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple disposable hosting sites, some of which are compromised WordPress uploads. The embedded URLs suggest an attempt to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5049

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/qer90p4if2762gbu5d9esvdfd3/mexuvimosotomix.pdf In PDF document text
    • http://rotarycochinharbour.org/ci/userfiles/files/juwemezawifenupapij.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/lfjkbo3vr1ubnch6gidro0j9ch/davez.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/bosugilisobopozepese.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/35623597927.pdfIn PDF document text
    • http://trivio.it/userfiles/files/tosubifuvosapuxovusakiv.pdfIn PDF document text
    • http://infiniti.e-library.tw/uploads/files/30202939160.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/00d51a5135661bfa2d24798fde966b24/7666749687.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/62463318196.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/85129080111.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/9557c41e3fcc85481f679d2325010571/mopoxarebebeguzarexijum.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/67493853830.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/644phack2s30ma5ls1h3pq2q48/74124117560.pdfIn PDF document text
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/45099896870.pdfIn PDF document text
    • http://schokozentrale.de/idata/dosudofupibapij.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/e2c16f935bb7fe2343d96924c6a59eea/ladaku.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/df28e0fd16724408143929ddc08e48b7/nudazavubetuselef.pdfIn PDF document text
    • http://constantemails.com/userfiles/file/162866416698906390389.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/gegirivobotuk.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607475f354928---nakomifadeponudetoxe.pdfIn PDF document text
    • https://j26clean.com/upload/files/17757675477.pdfIn PDF document text
    • https://digitaldaya.com/imagenes/file/13843427836.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/bexezegigogosatajekuxavor.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/mc3ggap9n2o041c7sl0gvef191/gudosa.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160714d2d0f6c9---15912912768.pdfIn PDF document text
    • http://garantc.ru/userfiles/file/ruwejipenujapomizebibep.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607db8850043a---37381720361.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=watch+suite+life+of+zack+and+codyPDF link annotation
    • 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_off0000c33c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC33C 16876 bytes
SHA-256: 03ed516bc18aede292aa1183762716ddebcf0b81d09c671a1d86ceb1619fa1c1
font_01_sfnt_off0000ef58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF58 10832 bytes
SHA-256: b17c1a75c9ed4eb3cb826ae62882334b3374d7dcd98cb29b5c712ea5d4b7b5fe
font_02_sfnt_off00010868.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10868 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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