Malicious PDF — malware analysis report

Static analysis result for SHA-256 d249af48c5099101…

MALICIOUS

PDF

104.4 KB Created: 2021-08-05 23:10:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1b08346e603d203a7857ec9ea08543ce SHA-1: a8635e817d4d7833534cb3def481c83e7b7e824e SHA-256: d249af48c50991018d88e880d76c35f9d7cd5745806757b0c017614b10e7af82
164 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to obscure the final destination. The presence of urgency language further supports a phishing or social engineering attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://computerzone.pk/file/41763651356.pdf In PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d9c4a121c0---90299784334.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/nedasuragokejudejepirax.pdfIn PDF document text
    • http://euro-ex.com/images/blog//file/zoxamufagokesobakova.pdfIn PDF document text
    • https://datajournonepal.org/files/dovamopejen.pdfIn PDF document text
    • http://alphaconsultinggroup.us/vpw/images/file/zowogowosemutogevopuso.pdfIn PDF document text
    • http://csc0898.com/userfiles/file/20210707170329_secwa1.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160836372ee877---30575542617.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/24275098250.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/bu91uaot0tk3ai50idagr0q6e5/delar.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/16b191061c78f35384011b94ea4fcbca/pewakazox.pdfIn PDF document text
    • https://bostoncake888.com/UserFiles/files/linazurejigotiz.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/09bee7dea546abf1de0693db0349c6e9/30756703021.pdfIn PDF document text
    • https://perfecthospitals.org/FCKeditor/file/25929074523.pdfIn PDF document text
    • https://gegeny.hu/uploads/file/vujadineteruravemu.pdfIn PDF document text
    • https://aquamedicasatumare.ro/ckfinder/userfiles/files/61099259442.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2725082f58---fabafesupif.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a4650ec7a7d---93195542860.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160944c82207a5---petusiluxonaziruwufi.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8a6ed4e908---47710676484.pdfIn PDF document text
    • http://qiangka.com/ckfinder/userfiles/files/dizuxazomarodarusakoma.pdfIn PDF document text
    • http://farashimirooz.com/files/51331625439.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/e07f2daa4e9924ff3b709ae41e5af533/geratoruk.pdfIn PDF document text
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/39271274562.pdfIn PDF document text
    • https://alternatifhirdavat.com/upload/ckfinder/files/16393184381.pdfIn PDF document text
    • http://sunjewelsonline.com/userfiles/file/tipemijowegizima.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=the+three+questions+commonlit+answer+keyPDF 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_off000134fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134FC 10996 bytes
SHA-256: f4b6ac5b4957569db6d09b752d79a62ca1b16654c6411b1df776cac7480770cd
font_01_sfnt_off00014e77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016689.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16689 17160 bytes
SHA-256: 0b7df3291cc9c062aa91a74ceb3116f80d02a7bb3ae17df6ac5514ae54ed1aad