Malicious PDF — malware analysis report

Static analysis result for SHA-256 e38680019ef56251…

MALICIOUS

PDF

87.6 KB Created: 2021-07-22 18:58:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 16b1e89d2bc05feb27ee4b44f33eb12c SHA-1: 1035f2c7a20e18e7078c32e4ba79d6d9a4e4e6df SHA-256: e38680019ef562510ae586926a2fb1ed84fce702e9a0987863b9bf5acb0e0560
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, specifically flagged as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. The presence of numerous links, some with UTM parameters, suggests an attempt to obscure the true destination and potentially engage in SEO manipulation for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/b30d4cd1171396feaad7a2e9d013ddc5/68559689398.pdf In PDF document text
    • https://cengilli.com/icerik_images/file/kobaxoxew.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160918b4430234---27754075361.pdfIn PDF document text
    • http://mrpokedb.com/uploads/files/23958902037.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/t50bsio58dl87dvpd78l7tmi51/934183386.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/632412165a38fd0408d9b3e242eacdc4/mezobituju.pdfIn PDF document text
    • https://optimustelecoms.com/ckfinder/userfiles/files/naxob.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160f84056ad9a6---tunafipofatomeb.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e124472dd7a---66542432211.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/njclsu9k7ts70dnuacvclkrp53/1183918960.pdfIn PDF document text
    • http://anandtouristcorporation.com/uploads/24426325928.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/m97jna8mek6kjemq86j8kjlql2/tedaritezetu.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/tokuzobi.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf4979a448---58390405256.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/1b637b7dd34ed9e42c4284f5ba35aa0f/93112984771.pdfIn PDF document text
    • http://amdind.com/userfiles/file/vakifodovogenafivine.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160b303ffb4971---95318108830.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/5ab5db518b0a6f170cc0012c7b89087d/62189096546.pdfIn PDF document text
    • https://nutstudio.it/userfiles/file/6121016666.pdfIn PDF document text
    • https://www.nexidia.it/wp-content/plugins/super-forms/uploads/php/files/e250260be9e40d1fb2ea788f7773a0fd/samedopodegude.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/2745e028264d9be38e8ff33317c63b20/38348773133.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/file/bolevufifemevowopap.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/cnbi8ko9638dvaj6cff41t5l30/97861671288.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/16083f1247c513---xuvirupaluvopivemotibiruf.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bbab0496f7d---73153575056.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=black+knights+fortress+osrs+guidePDF 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_off0000f328.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF328 11000 bytes
SHA-256: c65d5c7a8f047ca2e7bac1648e5b9825229bc1e100e56ddeeec3584b02636fc3
font_01_sfnt_off00010c7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C7D 17112 bytes
SHA-256: a62312a3eabfe9b3cac0aacd15fbd694cb08e33686cf6b83c928470a1dcbb3a1
font_02_sfnt_off000138e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1