Malicious PDF — malware analysis report

Static analysis result for SHA-256 a285b5449f9a97b7…

MALICIOUS

PDF

77.3 KB Created: 2021-09-21 03:22:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6126f7c650b7f1e3d2ae12ca1f7cbf3b SHA-1: de37f5694f9b26daa0e1f21f962df6293526cd8f SHA-256: a285b5449f9a97b714887be4ead1d821d1e21d166124dcf7ed851903c4babdb1
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning model indicated a high probability of maliciousness. Heuristics identified it as a link farm, with many URLs pointing to potentially compromised websites or disposable hosting. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure suggests an attempt to redirect users to malicious external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

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://autodilykanka.cz/cmsimple/images/file/vaxovoverodukijunom.pdf In PDF document text
    • http://pcwenhua.com/uploadimg/file/1632178178823887523.pdfIn PDF document text
    • http://dailycan.com/userfiles/files/xowugagakojalukejoxaga.pdfIn PDF document text
    • http://imobiliariaimperio.com/files/files/dibekurujosexepogu.pdfIn PDF document text
    • https://thefencedocumentary.ca/adminfiles/file/86821617790.pdfIn PDF document text
    • http://52fotki.ru/ckfinder/userfiles/files/12488317536.pdfIn PDF document text
    • https://kujainspectors.com/candyticket/uploads/page_images/files/20831694027.pdfIn PDF document text
    • https://lederstuhlshop.de/ckfinder/userfiles/files/tipog.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/f02b6933507737f7185c4949ed5ef5d5/26999338071.pdfIn PDF document text
    • http://ge-mak.com/files/lutujukowosipizagedununo.pdfIn PDF document text
    • http://myucpb.net/userfiles/file/letevo.pdfIn PDF document text
    • http://reginahajo.hu/_user/file/kusulifitafomidun.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c110259ec7---40152529392.pdfIn PDF document text
    • http://oipipleszno.pl/userfiles/file/vajovogu.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/r1k2s4itehh8fhdb85vdcg1gud/fuzazarimajajitarozen.pdfIn PDF document text
    • https://leresto-niort.fr/images/userfiles/files/28575404734.pdfIn PDF document text
    • http://exosushi.com/uploads/files/gutivowizejunizo.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1613056589659b---50102077709.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/e93dab67bd1ddb30b68780a04a121acb/97994803757.pdfIn PDF document text
    • http://innovad-ltd.com/userfiles/file/21598633851.pdfIn PDF document text
    • http://bielle-srl.com/userfiles/files/35844033104.pdfIn PDF document text
    • http://punaide.com/userfiles/files/32962218858.pdfIn PDF document text
    • https://yukkumpulgroup2.com/contents/files/7962224126.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148fc9802648---76537682768.pdfIn PDF document text
    • https://csodamalom.hu/files/files/70120147764.pdfIn PDF document text
    • https://www.verimevzabavu.cz/ckfinder/userfiles/files/17748924235.pdfIn PDF document text
    • https://thai-airpark.com/ckfinder/userfiles/files/laladobudegabusavaliwox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=genshin+impact+gamepad+androidPDF 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_off0000c964.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC964 10952 bytes
SHA-256: 18643d37191d1263af00d311237c57d39a9e0f06a360f2683fc7d6f12fe31a7c
font_01_sfnt_off0000e266.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE266 17240 bytes
SHA-256: 5421c5d868aaba4c749104a96fdf6b8ad6a241763581ca1d5215d8d83d33657f
font_02_sfnt_off00010f2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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