Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa925c0a0817f781…

MALICIOUS

PDF

84.8 KB Created: 2021-07-25 13:21:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: d7911ca71a4f01ab530fb1f8d259704b SHA-1: fc06419c8acd09ee3502b82b3536e1c6ec15d222 SHA-256: aa925c0a0817f781b1efdc6302a2dda18ac8e3b4fbad54026996cd43da05efc7
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The presence of these links and the heuristic firings strongly indicate an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8171

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
  • 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 http://banlinhkienlaptop.com/userfiles/file/pulaxovisiwiwasovu.pdf In PDF document text
    • http://mvclassof1990.com/clients/8/8c/8ca0ba2c7a07c5cd1f21f9fc323c16c5/File/xobuzagajuzakisesi.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/47fe6ec3df66614c9a0aef34eb6ecc0f/fozuvajenapakemoxixofo.pdfIn PDF document text
    • https://bangprice.com/bangprice.com/beta/cms_image/file/pidavetidiwesodilazo.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16079a7bc3d5bd---3137572835.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160948fdf0030c---29306400195.pdfIn PDF document text
    • http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/wunelemasakunewifaji.pdfIn PDF document text
    • http://thompsonhigh1980.com/clients/4/48/48b9e10b24f1ac3c627dfd5bb8c45987/File/pokogitefivugupav.pdfIn PDF document text
    • https://celebicatering.com/upload/ckfinder/files/jenozipomozotag.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ecef21e0e7---perulofix.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/22128305827.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9fbc6021d9---60963068027.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160913bb2a5d9b---nubajiragebifexajujokobax.pdfIn PDF document text
    • http://arablift.net/userfiles/file/12053637087.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210521020847_nsxwhx.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/tarumagulux.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087e4c2743c5---duganomuserunez.pdfIn PDF document text
    • https://ystechpro.com/nbloom/fckuploads/file/68134154526.pdfIn PDF document text
    • http://ligonfamilyreunion.org/clients/9/9a/9a44987365eba454cd9b2deda39aa7c0/File/31637423105.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6f4018e02---rufarojesokegejojuvatogox.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/46646059910.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=razer+cortex+games+mod+apkPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA8D 17516 bytes
SHA-256: a5f5f83bc4069c8fe44a92ccddc0e90e6f09ec07d1a834dc253f2777ad85032b
font_01_sfnt_off0001089d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1089D 10912 bytes
SHA-256: 2e4349176373f3a86100aa3ac82b2038419fd15bf46183dfd02d13528fd10bb5
font_02_sfnt_off000121dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000139ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139EE 16080 bytes
SHA-256: 2f1582c392244cc8e82654cac2cb77e5d9d2c421bb9509a139093d723174ec3d

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