Malicious PDF — malware analysis report

Static analysis result for SHA-256 0269d6ad9effc4b0…

MALICIOUS

PDF

164.0 KB Created: 2021-08-14 05:20:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c8471e368094fc0478b1a32f7c5aede0 SHA-1: a105be98ed5decf209125b5868890e828c0d213f SHA-256: 0269d6ad9effc4b0202fa91c33d116ca951d3b58f7b492a38b8e57067b02ce81
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous external URIs pointing to various domains, many of which appear to be compromised WordPress sites. This suggests the primary purpose is to redirect users to potentially harmful content or for SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9158

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://nomylo.ru/uplcv?utm_term=current+psychotherapies+10th+edition+apa+citation PDF link annotation
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160afd8188f1b3---biduvep.pdfIn PDF document text
    • https://aldurra.ly/images-editeur/img/file/86325995262.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/co072lkac5uuf28u9snaoav4el/latefuxulokoje.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/oi17s0fte3sn052g9l3poehk33/60257052177.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/82570128156.pdfIn PDF document text
    • http://cariboohose.com/userfiles/file/zaposazak.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/2626aff90c8f5c9ea1966268704840ad/tilidusomuledofatij.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/winidoxejutuniwafuw.pdfIn PDF document text
    • https://ises.ca/phpsites/vertical_living/uploads/file/28179584375.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adf85247722---9556351972.pdfIn PDF document text
    • http://letresorellebio.it/userfiles/files/zoxusa.pdfIn PDF document text
    • https://b2b-intelligence.it/uploads/file/40494143314.pdfIn PDF document text
    • https://juraganmonyet.com/contents//files/pevebu.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160770569c2096---kidefuvixivubuwetumu.pdfIn PDF document text
    • http://perila-vrn.ru/userfiles/file/34057646313.pdfIn PDF document text
    • http://srtprogetti.eu/userfiles/files/bazerivobuvosafi.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/5eb47c23a477366c3ed2dec8579a362c/12894941018.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160703d79de1bf---vixabominuvaxemizenib.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/93381276173.pdfIn PDF document text
    • http://asianmosaicnyc.com/userfiles/file/37106046506.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160c4420bc3f54---99661951429.pdfIn PDF document text
    • http://x04ydivan.ru/userfiles/file/dubopiparaxid.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/6c6bfc540d082b4ad422067b839233b0/19285420891.pdfIn PDF document text
    • https://devcons.org/uploads/userfiles/files/nefelenavuju.pdfIn PDF document text
    • http://wonderful-foods.net/userfiles/file/nesakaraf.pdfIn 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_off00022709.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22709 21132 bytes
SHA-256: 755639359315a229bec0b9f51f32e564832e93ee3fea3795d713e43af2f4f1fa
font_01_sfnt_off00025dfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25DFE 10984 bytes
SHA-256: b263528a5220679bab1004f0d1786251bda7c8faf6afff57821211db8c1d0106
font_02_sfnt_off00027785.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27785 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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