Malicious PDF — malware analysis report

Static analysis result for SHA-256 b04845e1c3f99bf7…

MALICIOUS

PDF

81.5 KB Created: 2021-09-14 08:36:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ac76045903f6c4233d3716abef96531f SHA-1: 6876077d7db105880255e4d5856f672a2f64e998 SHA-256: b04845e1c3f99bf75156704b0e0008e25efb8792e8635d0188dcb2bb2683b121
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. The presence of 'utm_term=recoverit+for+android' in one URL suggests a lure related to software recovery, a common phishing tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://hengtongrongshang.com/jingkelun/userfiles/files/20210906214738.pdf In PDF document text
    • http://posuni.com/userfiles/file/30862828841.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613995c11df73---43184718287.pdfIn PDF document text
    • http://primeasset.hu/fileok/file/36544064002.pdfIn PDF document text
    • http://asu78.ru/userfiles/file/15643778456.pdfIn PDF document text
    • http://gizmakina.com/depo/sayfaresim/file/66650907442.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/1630657745217.pdfIn PDF document text
    • http://sskj.pl/userfiles/file/sobuzugotipefamuroxof.pdfIn PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/66526425420.pdfIn PDF document text
    • https://gornjastubica.hr/files/2873538212.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/30270537776.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/3a8f25d29cb8155df70d86b22b61d2bb/7380484844.pdfIn PDF document text
    • https://stpatswatertown.org/ckfinder/userfiles/files/varumubuvobopexovibobema.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/rufutosidepetapu.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/161367551589e5---varotadat.pdfIn PDF document text
    • http://safiorida.dk/operatori/userfiles/file/94639968787.pdfIn PDF document text
    • http://btfa.tw/upload/files/direnakifugugenuvabowu.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613e483372873---paruniwug.pdfIn PDF document text
    • http://sluchatka-shop.cz/files/upload/files/38923913871.pdfIn PDF document text
    • http://houselandia.ru/files/90723221666.pdfIn PDF document text
    • http://terminsk.by/pics/files/kosajeri.pdfIn PDF document text
    • https://quangcaowebsite.vn/uploads/files/niluxibadowuvobosuxigo.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133472857445---wikulov.pdfIn PDF document text
    • http://studiogalata.it/userfiles/files/fotojatoben.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=recoverit+for+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_off0000dac2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC2 17584 bytes
SHA-256: 8bec6cadb0da2f594cd4dcb5a33f57efb00149e5eceadfc113bd948fa93f66e8
font_01_sfnt_off00010892.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10892 10368 bytes
SHA-256: caad3e5456c0a81025eb999e0a823d394bbdad71d45982e26fd9842867f34081
font_02_sfnt_off00012029.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12029 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.