Malicious PDF — malware analysis report

Static analysis result for SHA-256 d89bbb2e5bf7d037…

MALICIOUS

PDF

91.4 KB Created: 2021-07-12 23:43:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 734600a87e83f731fd0aac41302c53b6 SHA-1: 8f9a49a8ba23ab6a080baeb909343f344d7e1d10 SHA-256: d89bbb2e5bf7d0376987b583dfa064eb97327e5470708fe72f92cfc04876aee7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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, with many URLs pointing to compromised CMS uploads or disposable hosting, suggesting an attempt to distribute or host malicious content. Although no scripts were extracted, the presence of numerous external links and the ML/ClamAV detections strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://dmkaudit.sk/101/upload/file/8647505408.pdf
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0b2cc84223---52538250046.pdf
    • http://solarhomepage.ch/fckeditor/editor/images/file/jubexubadefelefajifojexok.pdf
    • http://jp-photo.cz/soubory/files/36131420975.pdf
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607587eba0890---gixavimufafemodub.pdf
    • http://alexlunacoach.com/img/editor/file/kuzipozasikupiz.pdf
    • https://cualuoihoanmy.com/uploads/userfiles/file/fomatozeli.pdf
    • http://indovinandoilmondo.it/themes/userfiles//files/lufiw.pdf
    • http://beloezoloto.ru/userfiles/file/pinixabazupamadunav.pdf
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f478ee3ae3---lawepur.pdf
    • http://bahtiyardishekimi.com/fckfiles/file/36883643435.pdf
    • http://gayaarchi.com/userfiles/file/20210603012546.pdf
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dadd924d834---38679657136.pdf
    • http://nsdadventist.org/FCKData/file/13841604985.pdf
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/vq2hnt19dqenqbjuad8mm1avh0/lugebavigon.pdf
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/195b6de0ebddb8bf3a6a5712723cc577/bezemegisaf.pdf
    • http://ankurgroups.com/userfiles/file/zivipugame.pdf
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d90e624ace---zufefutov.pdf
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/16086dfa98a501---zomupaxanop.pdf
    • https://sjalikave.hu/pictures/file/99903244978.pdf
    • https://chinese-wall.tw/upload/files/69023474959.pdf
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/2jtksdqh275r35ubu6gf8ju1l1/gamilibijuwubomitobozumi.pdf
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/nfddlh6li4v3ed4qe1gkmmtii4/84031944330.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=shadow+fight+2+level+52
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e605.bin
d2a545cb5d3dc278a429f4e9840095239eef8b603bf9968925a303b639d7f6e6
pdf-font-stream PDF embedded font (sfnt) at offset 0xE605 17168 bytes
font_01_sfnt_off0000ff91.bin
c6013edb89c7618ed13d4efd4f2dafdd4b62c987dad35ebd4705fc3a9a466eec
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF91 10740 bytes
font_02_sfnt_off0001185d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1185D 16792 bytes
font_03_sfnt_off0001306f.bin
690290fd912464ab0359f3a618ea0472318a2702df454e0420258e98443f6e59
pdf-font-stream PDF embedded font (sfnt) at offset 0x1306F 18452 bytes