Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e36c7d460d528c2…

MALICIOUS

PDF

78.6 KB Created: 2021-09-23 15:22:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8a78dfaecb1930e8704f7d6b7c8bd852 SHA-1: a72c757c9e6540772159ee3becf8d280d2212e1a SHA-256: 8e36c7d460d528c2e9b476d360a65b72e90c75b2c0344c0ee12396db8145f906
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms or disposable domains. The embedded URLs, such as 'https://archism.ru/uplcv?utm_term=does+my+phone+have+a+hotspot', are likely part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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
  • 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 https://archism.ru/uplcv?utm_term=does+my+phone+have+a+hotspot PDF link annotation
    • http://euroambulans.pl/userfiles/file/14233569493.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/1ll9eeebada8hl7kqbi9u48r54/37679009927.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140eacb5be4e---xofobuxu.pdfIn PDF document text
    • http://mrs724.ir/basefile/drtiketcom/files/tugetigojikutumebokesife.pdfIn PDF document text
    • https://mavibusiness.it/file/gifabivedusob.pdfIn PDF document text
    • https://namphuctourist.com/userfiles/file/tezubotep.pdfIn PDF document text
    • https://pellevah.com/upload/files/71913437048.pdfIn PDF document text
    • http://hamkr.com/userData/board/file/datujejakuzisewavo.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/10657914221.pdfIn PDF document text
    • https://latrinquette.com/upload/editor/file/56759236677.pdfIn PDF document text
    • http://hoshitorionline.com/uploads/files/97167725926.pdfIn PDF document text
    • http://korsorlampang.net/user_img/files/59480836897.pdfIn PDF document text
    • http://packturf.fr/files/zevamigafipumobadurixisin.pdfIn PDF document text
    • http://yh-nutri.com/filespath/files/20210918234610.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/pb3ul511v2hb6dvq8sttp8vdc3/60971891464.pdfIn PDF document text
    • https://xehowo24h.com/images/ckeditor/files/5840325013.pdfIn PDF document text
    • http://hissekurban.com/resimler/files/1212580828.pdfIn PDF document text
    • http://agenturamotivace.cz/uploadfiles/file/89313556144.pdfIn PDF document text
    • http://tabletopad.com/images/file/59221609391.pdfIn PDF document text
    • http://win-sonic.com/ck_imgs/files/jusamapobij.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/3081509543.pdfIn PDF document text
    • http://davidhammerstein.org/ckfinder/userfiles/files/69054111288.pdfIn PDF document text
    • 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_off0000d0ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0AC 17360 bytes
SHA-256: 26cd8ca7047b4c9884d39d667e02ae312323a0439189252f519a58a8898b4e8a
font_01_sfnt_off0000fdac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDAC 10460 bytes
SHA-256: 1a2b33c5f24c893325aa5f2de279974e31b5516a58ceef0b4335c3989b9a32a9
font_02_sfnt_off00011550.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11550 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1