Malicious PDF — malware analysis report

Static analysis result for SHA-256 87ae65633add3fa1…

MALICIOUS

PDF

85.1 KB Created: 2021-09-23 03:24:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: e2592c0b609de8ec6e87efd54504e1d7 SHA-1: f2d07edcccd9ab0f52ef886e69ee6772b5f923e2 SHA-256: 87ae65633add3fa1c746be22959d9efd5ec5cd5b0c09b2e17264508122dda65b
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with multiple heuristics indicating it functions as a link farm. The embedded URLs point to compromised CMS uploads and disposable hosting, suggesting an attempt to lure users to malicious sites. No scripts were extracted, but the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://pistant.ru/uplcv?utm_term=android+form+app PDF link annotation
    • http://generoussecurity.com/uploads/meputog.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/13163374798.pdfIn PDF document text
    • https://infypos.com/infyposcms/media/gabuv.pdfIn PDF document text
    • https://cleanenergy.mn/uploads/files/jafibenexarulisudob.pdfIn PDF document text
    • http://keyday.ru/files/files/82935448323.pdfIn PDF document text
    • https://aiwatopup.com/ckfinder/userfiles/files/50207863218.pdfIn PDF document text
    • http://dichvugiayphep.biz/upload/ck/files/25835887956.pdfIn PDF document text
    • http://huynhgiabaohotel.com/uploads/FCK/file/36436354618.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/4d3b7454d7290435afdfe79546993407/30047737117.pdfIn PDF document text
    • http://softwaretesting.kr/club/data/userfiles/file/20210912042051.pdfIn PDF document text
    • http://tsyrulnikov.ru/upload/file/wonajofitegidoxuk.pdfIn PDF document text
    • https://tyko.pl/userfiles/file/jilebitozakaxirajebagovi.pdfIn PDF document text
    • http://fuyu.010bi.com/ckfinder/userfiles/files/97863283917.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16139868fea273---77520360226.pdfIn PDF document text
    • http://xn--38-mlcqjbufcz6h.xn--p1ai/userfiles/file/kudibezenekote.pdfIn PDF document text
    • http://friulanamarmi.it/images/file/59056562940.pdfIn PDF document text
    • http://cybernet-ap.com/UserFiles/File/wupefetosipiporuzazojuk.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/jhdlodnu4rsl798kqnf944glj4/75917769327.pdfIn PDF document text
    • http://ckattorneys.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/60969551472.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/28fca46733c77052220509b832707923/nakaveranasefax.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1614bb1ed6415d---8179995372.pdfIn PDF document text
    • http://dellalontra.it/userfiles/files/75679771120.pdfIn PDF document text
    • https://escritacontabilidade.net/fotos/news/file/wusuwakumaxesimazitomor.pdfIn PDF document text
    • http://www.almansori-ye.com/almansorifiles/files/xuxaxebuvi.pdfIn PDF document text
    • https://denimder.org/resimler/files/vufasaxogaxoju.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_off0000ec4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC4B 10196 bytes
SHA-256: d4b6a985b8161c524f91892bbb3713322e67ece5d3cf0f3807982d60e48acd1b
font_01_sfnt_off00010307.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10307 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B19 17180 bytes
SHA-256: bb8565b68288875b20107b43aa8edc04d52db18fa1cffa60d6e67c9f004036bd

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