Malicious PDF — malware analysis report

Static analysis result for SHA-256 896152a925119300…

MALICIOUS

PDF

78.6 KB Created: 2021-08-27 12:24:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4e46698da51204bcf0a94a408880cafa SHA-1: 66d2f08b9c8bf80adcb443c6a16c594fd64f3506 SHA-256: 896152a92511930083e5cb0437450270875daeb93a7c1c75b37ab2a294a64468
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Several heuristics point to the document being a link farm, with many URLs hosted on potentially compromised or disposable domains, suggesting a phishing or malware distribution attempt. The presence of external URIs and link farms strongly suggests the document's purpose is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://agataklimowska.pl/userfiles/file/45339854862.pdf In PDF document text
    • https://tskrea.com/userfiles/file/tamusuwalamened.pdfIn PDF document text
    • http://rotang.net/userfiles/file/50593436647.pdfIn PDF document text
    • https://nbcmedia.vn/ckfinder/userfiles/files/sezuloguwejofoxiw.pdfIn PDF document text
    • http://happypalettebnb.com/CKEdit/upload/files/besibewizivubum.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/161086d52e7496---59644760836.pdfIn PDF document text
    • https://mimpishio1.com/contents/files/waduz.pdfIn PDF document text
    • http://decaiyun.com/upload/file/21061802203024396903ped5mmdpgc.pdfIn PDF document text
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/mowurifineberolepa.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160f55db935cb7---migitezemexolam.pdfIn PDF document text
    • http://ibshop.gr/uploads/_uploads/files/88564643532.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fc37a4aba0c---fuxejaduberufodidem.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/kp7qdnu1qdmo7fe9m3p1um8vd3/wusinanilep.pdfIn PDF document text
    • http://fotografoenricogiampieri.it/userfiles/files/98203459523.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/16118ab28a0212---86240805148.pdfIn PDF document text
    • http://we-women.de/default/files/uploads/file/nuwozufikux.pdfIn PDF document text
    • http://cloverdiamond.com/file/67865693375.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/6832489804c3af2fc1dc66a197871a8e/44074214168.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/piqsh8j9mmhve4un5qnrcs5b3j/21598205263.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/62t3ccatc8hnfmbudnfs3krvca/49853234967.pdfIn PDF document text
    • http://blackivy.pl/userfiles/file/famava.pdfIn PDF document text
    • https://worldcastlive.com/userfiles/file/58482546350.pdfIn PDF document text
    • http://wawabed.pl/uploads/userfiles/file/74873357170.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/24f342ef0e035104ae4b9e8aa0446dd8/61598894882.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/44jp43183s0dt6115j3jcestq4/votugu.pdfIn PDF document text
    • http://gallery4walls.com/upload/editer/file/93360877109.pdfIn PDF document text
    • http://luatsubienhoa.com/upload/ck/files/10650124878.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=without+calculating+the+square+root+find+the+number+of+digits+in+the+square+root+of+36864PDF 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_off0000cc14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC14 11928 bytes
SHA-256: baddd72df0790cade93abbfc81ade07dc5584827cec87f6496a648ee170137d5
font_01_sfnt_off0000e819.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE819 16560 bytes
SHA-256: bd97d8e164090637ca5a7aa663ee67baf993ec0922d42e607850e20d0b1af602
font_02_sfnt_off0001132f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1132F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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