Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b35c7469b407ba5…

MALICIOUS

PDF

101.8 KB Created: 2021-05-10 03:47:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: a611f773d93504481f05297e7271257e SHA-1: 68602f196cee056257b8bb946f17616d26fff4b4 SHA-256: 1b35c7469b407ba5e42350488e426249e3e5ce048e67d501c1d4efda09e69233
156 Risk Score

Malware Insights

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

This PDF document was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan distribution attempt. It functions as a link farm, directing users to multiple compromised WordPress sites, likely to download further malicious content. The document body, though heavily obfuscated, suggests a lure related to 'antiterrorism training pretest answers'. No scripts were extracted, but the PDF structure and URL patterns are indicative of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7714

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 https://wastran.ru/uplcv?utm_term=level+one+antiterrorism+training+pretest+answers PDF link annotation
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/418298d2bde73713d766532194023ff3/nimoxufemitorezevuzifupej.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/a6122f6aa659b355d29018ac080c0b59/xalarisegabagov.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/rql8f21p2ojl9o2q39tcmihn5q/zoragutusuteserubez.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/4a95b17e2ff1c861106390229cb683fd/lajatiliwosezize.pdfIn PDF document text
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160840ff20d17c---7574621232.pdfIn PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070a39319681---39425148274.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/9fc2e833d475123ab7425f6329452975/56284227168.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607e274090dae---wojekevajibezerizixe.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/d28434965cbf95edda701d09d016c8cc/kokegobanawuw.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/54662012705.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/797ab4351689dc84c97c65dc1659c30c/taragujes.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/55fe8365335a486f0ff8672642bbcbd3/vepipe.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608395a233dcb---vigevazexalage.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/3galn6kqb69h4g2aa90d3nc9b0/mudibapesixomemigolapuwe.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/smvuqurb8lcp3eoidpk2cbbng5/jevukike.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160885f8a5f83f---12095197981.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/e07b41d139ab7a7abcb2f9af4ad9c187/rozitazegevige.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/h8t5gd66m5aql9cq962pda1ll1/52910718086.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://scripts.sil.org/OFLIn PDF document text
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013a24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A24 5232 bytes
SHA-256: 32089e0a98e0f35197ef3d8383a4fab8901c44589f0cd77569bf668ce2bea7b9
font_01_sfnt_off00014beb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BEB 1812 bytes
SHA-256: e2f5d3ef3d159c4618a897938a4514967e3e9e15e90b00f9078329914e8d563d
font_02_sfnt_off000154bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154BD 9952 bytes
SHA-256: ed336c6f73191c695b9936902eca2bee2de59149ab29c89da91321fe377b29d7
font_03_sfnt_off0001710a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1710A 10992 bytes
SHA-256: a02cda3f0bf7a190d007973ddde92a4531b45fd4dfcc67e325d7f04671a9ad8d

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